Lecture 19-LMMSE估计

mini lecture

Observing Behaviour Good morning, everyone. Today we will look at how to observe behaviour in research. Perhaps you would say it is easy and there is nothing extraordinary. Yes, you may be right. All of us observe behaviour every day. For example, when traveling in another country, we can avoid embarrassment by observing how people behave in that culture. And failing to be observing while walking or driving can be life-threatening. We learn by observing people's behaviour. Researchers too rely on their observations to learn about behaviour,but there are differences. For instance, when we observe casually, we may not be aware of factors that bias our observations, and, [1]and when we rarely keep formal records of our observations. Instead, we rely on our memory of events. [2]Observations in research on the other hand are made under precisely defined conditions, that is, in a systematic and objective manner, and with careful record keeping. Then how are we going to conduct observations in our research studies, and what do we need to do in order to make a scientific and objective observation? Now, as you remember, the primary goal of observation is to describe behaviour, but it is in reality impossible to observe and describe all of a person's behaviour. So we have to rely on observing samples of people's behaviour. Doing so, we must decide whether the samples represent people's usual behaviour. Thus, we will first take a brief look at how researchers select samples of behaviour. Before conducting an observational study, researchers must make a number of important decisions, that's about when and where observations will be made. As I've said before, the researcher cannot observe all behaviour. Only certain behaviors occurring at particular times, in specific settings can be observed. In other words, behaviour must be sampled. In this lecture, I will briefly introduce two kinds of sampling, that is, time sampling and situation sampling. Now first, time sampling. Time sampling means that researchers choose various time intervals for their observation. Intervals may be selected systematically or randomly. Suppose we want to observe students' classroom behaviour. Then in systematic time sampling, our observations might be made during five 20-minute periods, beginning every hour. The first observation period could begin at 9 am, the second at 10 am and so forth. [3]However, in random sampling, these five 20-minute periods may be distributed randomly over the course of the day. That is to say, intervals between observation periods could vary-some longer others shorter. One point I'd like to make is systematic and random time sampling are not always used in isolation. They are often combined in studies. For example, while observation intervals are scheduled systematically, observations within an interval are made at random times. That means the researcher might decide to observe only during 15-second intervals that are randomly distributed within each 20-minute period. [4]Now let's come to situation sampling. Then, what is situation sampling? It involves studying behaviour in different locations and under different circumstances and conditions. By sampling as many different situations as possible researchers can reduce the chance that their observation results will be peculiar to a certain set of circumstances and conditions. [5]Why? Because people

专八听力minilecture真题及答案doc

2015英语专业八级听力第一部分MINI-LECTURE LISTENING COMPREHENSION SECTION A MINI-LECTURE Understanding Academic Lectures Listening to academic lectures is an important task fro university students. Then, how can we comprehend a lecture efficiently I.Understand all (1) ______________ A.^ B.words C.(2) ______________ -stress -intonation -(3) ______________ II. Adding information A.lecturers: sharing information with audience B.listeners: (4) ______________ C.sources of information -knowledge of (5) ______________ 》 -(6) ______________ of the world D. listening involving three steps: -hearing -(7) ______________ -adding III. (8) ______________ A.reasons: -overcome noise -save time & B. (9) ______________ -content -organization IV. Evaluating while listening A.helps to decide the (10) ______________ of notes B.helps to remember information 答案:1. parts of meanings 2. sound/vocal features 3. rhythm 4. absorbing 5. subject 6. experience 7. reinterpreting 8. prediction 9. what to listen 10. Importance

托福听力中lecture记笔记的方法及要点

托福听力中lecture记笔记的方法及要点 自从走上托福听力的讲坛,我经常遇到各种因听力拖后腿而愁眉不展的考生,在听完学子们集体声讨听力段子难度无底限的同时,耳边总是回荡着考生们关于自己无法记下笔记的无奈。这年头,作为一位托福听力老师,手里没几个货真价实的笔记方法,你都不好意思跟学生打招呼;作为托福备考的学子们,要是没几个拿得出手的惯用笔记符号,你都没脸跟人家说自己曾经考过托福。 笔记到底应该怎么记,才会更有效率,笔者认为应该从以下几个方面来练习。众所周知,托福听力讲座呈现的美国大学课堂上的真实场景,教授的演讲总是遵循一定的逻辑和脉络的,常见的结构如总分式,先提出本课的重点,再从多个侧面展开论述,最后总结强调;或者常见于历史类讲座中的线型结构,按照时间的先后顺序进行讲解,这就要求我们在练习的时候,注意从整体上把握文章的结构,边听边划分文章的层次。 把握了文章结构之后,笔记的重点就应该瞄准文章的考点,比如举例论证是听力中出现的最为频繁的考点,出题的角度也是多种多样,在听到举例的时候应该在笔记上标出“eg.”的符号,并用箭头标注此事例的支撑点是什么;抑或是在师生互动的文章中,师生间的问答也是考点,一方面给出相应的背景知识,另一方面老师会对学生的观点进行评价。在平日的练习中,大家就要有的放矢的捕捉考点,逐一击破。 当然,在记笔记的过程中,也要讲究方式方法,平日练习的时候,应该多使用自己习惯的符号,如用星号或三角来表示强调重点;用Q & A 表示问答;用上下箭头表示增减;用单词的首尾字母代替完整的单词拼写,或者几个单词的首字母代替常用的短语。 总之:要想记好笔记,实力一定是第一位的。好的实力才能保证你在听的时候分出精力去辨别此处是否值

(完整word)新托福听力场景汇总之LECTURE篇(修正),推荐文档

新托福听力场景汇总之LECTURE篇 1.生物学 antibody抗体toxin毒素immunity免疫immunology免疫学vaccine疫苗fungus真菌bacteria细菌fermentation发酵inflection传染 / 感染microorganism / microbe微生物virus病毒disfection消毒sterilization灭菌biology生物学marine biology海洋生物学entomology昆虫学ornithology鸟类学microbiology微生物学genetics遗传学speciology物种学parasitology寄生虫学paleontology古生物学paleontologist古生物学家dinosaur恐龙die out / extinction灭绝mammal 哺乳动物carnivore食肉动物rodent啮齿类动物underwater水下的marine海洋的scuba 水下呼吸器diving潜水 / 跳水one-celled organism单细胞有机体tissue(动植物细胞的)组织protective camouflage保护色predator捕猎者oceanic海洋的snail蜗牛animal adaptation动物适应性survival of the fittest适者生存origin of species物种起源wild environment野生环境insecticide杀虫剂prenatal care产前护理habitat栖息地tentacle触须prey捕食navigate导航tiny receptor接收器nerve 神经/ specimen样品amphibian两栖类动物decline in the number数量减少gene基因genetic基因的,遗传的endangered species濒危动物survival活着的transition转变/过渡microbe 微生物yeast酵母(菌)bacteria 细菌single-cell单细胞reptile爬行类动物hatch孵化incubation 孵化nest巢offspring子孙chew up咀嚼unfertilized eggs未受精卵nutrient营养品nourishment营养品 / 食物feed喂养cannibalism同类相食respiration呼吸ingestion摄食digestion消化digestive enzyme消化酶cell细胞nucleus细胞核cytoplasm细胞质plasma lemma / cell membrane细胞膜cell wall细胞壁protein蛋白质amino acid核酸plankton浮游生物heredity遗传mutation of species物种变异chromosome染色体genetic engineering遗传工程solitary独居social群居bio-diversity生物多样性metamorphosis变态/变形mutation变种variation变异 2.动物学 zoology动物学Darwinism达尔文学说natural selection自然选择phylum门class纲order目suborder亚目family科genus属species 种invertebrate无脊椎动物vertebrate脊椎动物aquatic life水生动物reptile爬行动物amphibian/amphibious animal两栖动物protozoa原生动物rodent啮齿动物ruminant反刍动物parasitic animal寄生动物primate灵长动物plankton浮游生物mollusk 软体动物coelenterate腔肠动物(如水母、海蜇、珊瑚等)herbivore食草动物mammal哺乳动物homotherm恒温动物cold-blooded animal冷血动物poikilotherm变温动物scavenger食腐动物carnivorous食肉的herbivorous食草的omnivorous杂食的bird鸟类camouflage伪装hibernate冬眠;蛰伏regeneration再生predatory / carnivore食肉的predator捕食者prey捕食hordes/swarms (昆虫等)群flock(牛、羊等)群community动物的群落或人的部落population种群herd兽群hygiene卫生sanitation公共卫生;卫生设施monogamous一夫一妻的/一雌一雄的polygamous一夫多妻的/一雄多雌的polyandrous一妻多夫的/一雌多雄的nomadic游牧的;流浪的trapper诱捕动物者niche小生态环境vestige 退化的器官fertilize使受精metabolism新陈代谢breed(名词)品种;(动词)繁殖multiply / reproduce繁殖spawn(鱼、虾、蛙等)孵anatomy解剖学appetite食欲creature生物scales鳞feathers羽毛armor甲spinal cord脊椎digestive system消化系统excretory system排泄系统reproductive system生殖系统circulatory system循环系统respiratory system呼吸系统hormonal system内分泌系统digestive duct消化管esophagus食管stomach胃small intestine小肠large intestine大肠anus肛门digestive gland消化腺salivary gland 唾液腺liver肝gallbladder胆pancreas胰squirrel松鼠marten貂bat蝙蝠squeak(老鼠等)吱吱otter水獭antelope羚羊gorilla大猩猩chimpanzee黑猩猩baboon狒狒

专八听力:mini lecture解答技巧

听力section1 Mini-lecture 1. 首先是Mini-lecture部分,这是个确实让人挠头的部分,刚开始练习的时候正确率比较低,所以大家一定要耐心,多做练习,反复听,其中做mini的小窍门就是: (1)答案大多是名词居多,然后是形容词,最后才是动词。所以大家听的时候一定要对文章中的名词和形容词多留个心眼儿, (2)还有就是一定要把握文章的结构,参考书大家可以选用《英语听力快速突破—英语专业八级》点此查看。刚开始用这本书来练习,因为书中的答案讲得比较详细(对了,在最后的一部分我会对我使用的参考书做一一评价,大家敬请关注)。练得多了,自然就有感觉了。还有就是速记符号的使用,这个东西因人而异,所以不必拘泥于一种速记符号,只要自己能明白就好,举例来说,information--info,但是大家千万不要陷入到这样一个误区,就是光想着速记,而忘了你使用这些符号的目的,为的就是得分嘛,所以在听的时候要有个模糊的general idea,通过大约一个月左右的训练,基本上可以达到四五个的正确率了。如果说mini部分的难度值是9的话,那么下面部分的难度值就会直线下降,但是大家依然还是要给与高度重视,因为这是八级考试。 具体答题时需注意细节: 同一意思的不同表达法:对所听内容必须理解(一定要仔细听懂,宁可不写,也要听懂内容)之后,根据空格要求(因为空格所填词汇所要求的语法形式可能和你所听到的原文单词不同,甚至填的词汇是要求你经过概括总结后提炼出来的词汇,所以再三强调要求理解,理解之后才会产生优良的记忆,一定要仔细听懂,宁可不写,也要听懂内容),将原文意思通过另一种形式表达出来。 ·听记为主,笔记为辅(理解最重要,宁可不写,也要理解) 争取做到一心两用,做笔记的时候耳朵不能休息;对于那些大量罗列又细枝末节的信息,记个首字母甚至不留笔记都可以,关键是听清楚,记在心里。 ·听懂句子,抓住实词,放弃例证 ,在笔记中体现出来的应该是实词,即传达句子·紧跟提示词,笔记有条理 一般来说材料都会比较有条理 要包括以下几类: 1.解释性、态度性插入语; 2.祈使句; 3.疑问句; 4.逻辑关联词。 ·高度重视首尾部分

2019年托福听力讲座部分篇章结构之总分结构解题技巧

2019年托福听力讲座部分篇章结构之总分结构解题技 巧 托福听力,作为整场托福考试中耗时最长,强度的部分,一直是 所有考生出国留学征程上的拦路虎之一。面对无论是相对接地气的对 话部分(Conversation),还是绝对高大上的讲座部分(Lecture),一个 个学霸们都会肃然起敬,一片片学渣们更是闻风丧胆。以前,大家往 往认为,导致听力部分困难的原因是陌生词汇多,材料不熟悉。不管 是讲座部分涵盖的艺术人文(绘画/音乐/舞蹈/电影/雕塑/建筑),自然 科学(天文/地质/环境/生态),生命科学(动物/植物/微生物/基因), 社会科学(历史/政治/商业/心理/语言),还是学术场景类对话(论文/ 考试/办公室答疑),甚至是在最简单的生活场景类对话(图书馆/食堂/ 选课/就业)中,都有可能出现考生之前没有接触过的知识和情景。不过,这其实并不是最重要的原因,因为大家在完成托福阅读部分的时候,同样会遇到完全陌生的信息,却依然能够回去查看原文,通过考 点在文章中的定位来协助解题。而在听力部分中,考生却没有机会再 回去听力材料中寻找,因而必须在首次接触的时候,就搞清篇章结构,以便解题。 而且大家也都知道,托福中听力水平的测试,不但是通过听力部 分来实现的,也通过四道综合口语题,以及一道综合写作题来间接考查。不过万幸的是,托福口语后四道题中各自对应的那四篇听力材料,每一篇都有自己固定的结构,而托福综合写作里那段听力材料的结构 则更是千篇一律的三段式,所以考生相对来说还是比较容易把握。而 真正的听力部分中,结构还是比较多样化,不过即便这样,我们还是 能够将所有的文章划分成几种类型。下面,我们就具体来聊聊如何通 过一些关键的字词,来识别听力文章的结构,从而协助我们解题。 通常情况下,一次考试会有两个听力正题部分(Section),每个部 分包含一篇对话和两篇讲座。也就是说,每次考试中我们会有遇到两 篇计分的对话,和四篇计分的讲座。其中,所有的讲座结构又能够被

最新托福听力lecture的结构

托福听力lecture的结构 1. Lecture有结构 托福听力的lecture基本上都是总分总的结构,即「引入话题——展开讨论——教授总结」,下面分点论述: 1)引入话题 其实托福听力lecture里面讲课的教授就跟大家碰到过的老师一样,有的喜欢直入主题,有的喜欢拉七杂八。总的说来,lecture话题的引入方式有三种: ?开门见山:啥也不扯,一言不合就开车,比如TPO1 Lecture2:Ok, let’s get started. Great. Today I want to talk about a way in which we are able to determine how old a piece of land, or some other geologic feature is –dating techniques. ?课程回顾:回顾上堂课的内容,然后再切入本堂课的内容;一般来说本次是上次的细化或者与上次的对比。比如TPO5 Lecture2:Last week, we covered some arguments against going back to the Moon. But there are compelling reasons in favor of another Moon landing too, um…not the least of which is trying to pinpoint the moon’s age. ? ?啰哩吧嗦:有的教授实在是特别啰嗦,比如TPO2 Lecture2:Hi, everyone. Good to see you all today.【你也好啊】Actually, I expected the population to be a lot lower today. It typically runs

2010年英语专八听力mini-lecture原文+解析

今年的讲座名为“Paralinguistic Features of Languages”,主题是辅助语言学,对于英语专业的学生来说,这个话题或许没有专门学过,但并不陌生。讲座类的内容非常突出的特点就是逻辑性强,思路很清晰,所以在听音频做笔记的时候,要特别注意总起性质的句子。一般来说lecture的第一段会对接下来的内容做总结介绍,如果下文划分成若干个小类别,会概括性地提到这些类别,然后在后文进行详细的例证、再分类。第一段对给考生一个宏观性的思路非常重要,听漏掉一两点也没关系,下文必然会重新提到。 本次真题的听力原文如下,注意文章中标粗的部分,是记笔记的重点部分: Paralinguistic features of languages Good morning, everyone. Today we'll continue our discussion on describing language. Last week we examined such features of language as grammar, vocabulary, the sounds of language, etc. In this lecture, we'll look at another important aspect of language. Perhaps some of you may wonder what is this important aspect of language. Let me tell you. It refers to features of communication that takes place without the use of grammar and vocabulary. They are called ‘paralinguistic features of language'. These features fall into two broad categories: those that involve voice and those that involve the body. Now, the first category, is what we call vocal paralinguistic features. Vocal features are actually tones of voice. While they are, perhaps, not central to meaning in communication in the same way as grammar or vocabulary, they may, nevertheless, convey attitude or intention in some way. Let me give you some examples. The first is whispering, which indicates the needs for secrecy. The second is breathiness. This is to show deep emotion. The third is huskiness, which is to show unimportants. The fourth is nasality. This is to indicate anxiety. The last is extra lip-rounding, which expresses greater intimacy, expecially with babies, for example. So we can see that there are a number of ways of altering our tone of voice. And when we do this consciously, we do it to create different effects in communication.

托福听力TPO30原题答案解析Lecture1psychology

今天,环球托福为大家带来托福听力TPO30原题答案解析Lecture1psychology,承接托福听力TPO30原题答案解析conversation1,环球托福继续分享托福听力好文章。Metacognition 托福听力TPO30原题 What is the lecture mainly about ? A.The difference between cognition and metacognition B.A study showing that dolphins have less cognitive capacity than monkeys C.The effectiveness of using food as a reward in experiments with monkeys D.Research that investigates whether animals are aware of feeling uncertainty 答案:D 解析:教授讲了猴子和海豚也许会有metacognition,也就是 feel uncertainty。通过海豚和猴子的实验证明这个结论,但不是把猴子和海豚拿去对比。 Why does the professor mention the inability of animals to report what they are thinking ? A.To emphasize that language learning is an ability unique to humans B.To explain why researchers must be sensitive to nuances in animals' behavior C.To point out a difficulty in testing for metacognition in animals D.To show the need for advancements in the study of animal communication 答案:C 解析:Researchers have long been interested in whether possess this capability but they couldn’t test it. Because animals are unable to report their feelings. In the dolphin study, how did the researcher make the dolphin's task increasingly difficult ? A.By showing the dolphin two patterns that were similar in density B.By playing two sounds that became progressively closer in pitch C.By producing sounds that were just within the dolphins' range of hearing D.By introducing a third paddle that ended on trial an began a new one 答案:B 解析:The closer we came in pitch to the first one, the harder will be for the dolphin to correctly identify as it lower. 这些比较说明是通过逐渐改变pitch来实现难度增加的。 According to the professor, what objections did some researchers raise with regard to the dolphin study? A.The study did not distinguish between learned and higher-level responses.

托福听力lecture的结构知识讲解

托福听力l e c t u r e的 结构

托福听力lecture的结构 1. Lecture有结构 托福听力的lecture基本上都是总分总的结构,即「引入话题——展 开讨论——教授总结」,下面分点论述: 1)引入话题 其实托福听力lecture里面讲课的教授就跟大家碰到过的老师一样, 有的喜欢直入主题,有的喜欢拉七杂八。总的说来,lecture话题的 引入方式有三种: ?开门见山:啥也不扯,一言不合就开车,比如TPO1 Lecture2:Ok, let’s get started. Great. Today I want to talk about a way in which we are able to determine how old a piece of land, or some other geologic feature is –dating techniques. ?课程回顾:回顾上堂课的内容,然后再切入本堂课的内容;一般来说本次是上次的细化或者与上次的对比。比如TPO5 Lecture2:Last week, we covered some arguments against going back to the Moon. But there are compelling reasons in favor of another Moon landing too, um…not the least of which is trying to pinpoint the moon’s age. ? ?啰哩吧嗦:有的教授实在是特别啰嗦,比如TPO2 Lecture2:Hi, everyone. Good to see you all today.【你也好啊】Actually, I expected the population to be a lot lower today. It typically runs

托福听力Lecture 分类词汇完整版

Lecture 分类词汇完整版 1. 生物学 antibody抗体toxin毒素immunity免疫immunology免疫学vaccine疫苗fungus真菌bacteria细菌fermentation发酵inflection传染/ 感染microorganism / microbe微生物virus 病毒disfection消毒sterilization灭菌biology生物学marine biology海洋生物学entomology 昆虫学ornithology鸟类学microbiology微生物学genetics遗传学speciology物种学parasitology寄生虫学paleontology古生物学paleontologist古生物学家dinosaur恐龙die out / extinction灭绝mammal哺乳动物carnivore食肉动物rodent啮齿类动物underwater 水下的marine 海洋的scuba 水下呼吸器diving潜水/ 跳水one-celled organism单细胞有机体tissue(动植物细胞的)组织protective camouflage保护色predator捕猎者oceanic snail蜗牛animal adaptation动物适应性survival of the fittest适者生存origin of species物种起源wild environment野生环境insecticide杀虫剂prenatal care 产后护理habitat栖息地tentacle触须prey捕食navigate导航tiny receptor接收器nerve / specimen物种amphibian两栖类动物decline in the number数量减少gene基因genetic基因的,遗传的endangered species濒危动物survival活着的transition转变/过渡microbe微生物yeast 酵母(菌)bacteria 细菌single-cell单细胞reptile爬行类动物hatch孵化incubation孵化nest巢offspring子孙chew up咀嚼unfertilized eggs未受精卵nutrient营养品nourishment营养品/ 食物feed喂养cannibalism同类相食respiration呼吸ingestion摄食digestion消化digestive enzyme消化酶cell细胞nucleus细胞核cytoplasm细胞质plasma lemma / cell membrane细胞膜cell wall细胞壁protein蛋白质amino acid核酸plankton浮游生物heredity遗传mutation of species物种变异chromosome染色体genetic engineering 遗传工程solitary独居social群居bio-diversity生物多样性metamorphosis变态/变形mutation变种variation变异 2. 动物学 zoology动物学Darwinism达尔文学说natural selection自然选择phylum门class纲order 目suborder亚目family科genus属species 种invertebrate无脊椎动物vertebrate脊椎动物aquatic life 水生动物reptile爬行动物amphibian/amphibious animal两栖动物protozoa原生动物rodent啮齿动物ruminant反刍动物parasitic animal寄生动物primate 灵长动物plankton浮游生物mollusk软体动物coelenterate腔肠动物(如水母、海蜇、珊瑚等)herbivore食草动物mammal哺乳动物homotherm恒温动物cold-blooded animal冷血动物poikilotherm变温动物scavenger食腐动物carnivorous食肉的herbivorous食草的omnivorous杂食的bird鸟类camouflage伪装hibernate冬眠;蛰伏regeneration再生predatory / carnivore食肉的predator捕食者prey捕食hordes/swarms(昆虫等)群flock (牛、羊等)群community动物的群落或人的部落population种群herd兽群hygiene卫生sanitation公共卫生;卫生设施monogamous一夫一妻的/一雌一雄的polygamous一夫多妻的/一雄多雌的polyandrous一妻多夫的/一雌多雄的nomadic游牧的;流浪的trapper诱捕动物者niche小生态环境vestige 退化器fertilizer使受精metabolism新陈代谢breed(名词)品种;(动词)繁殖multiply / reproduce繁殖spawn(鱼、虾、蛙等)孵anatomy解剖学appetite食欲creature生物scales鳞feathers羽毛armor甲spinal cord脊椎digestive system消化系统excretory system排泄系统reproductive system生殖系统circulatory system循环系统respiratory system呼吸系统hormonal system内分泌系统digestive duct 消化管esophagus食管stomach胃small intestine小肠large intestine大肠anus肛门

托福听力结构理解 TPO41-lecture1

托福听力结构理解 听力提升太难了????? 今日案例分享: 学生每早会听半小时托福听力,很坚持。 但是听力分数偶尔几分,偶尔十几分。 不是说好的坚持就会有进步吗?为什么这么颠簸不前呢?一问之下:只是听,并没有懂。 如果只是听: 有的同学大约是听着听着睡着啦,听力有助于入睡; 有的同学大约是听和尚念经,叽里咕噜,并不知道在说什么; 真的很坚持,不要灰心,一年半载之后还是会有进步的,只是效率会有点低; 那么如何化坚持为快速进步呢? 答案:听多少内容就要听懂多少内容 以免浪费练习的素材 托福听力考察的能力图: 基本信息 --->直线推断--->结构理解 针对基础薄弱: 词汇不懂/找词汇 句子不懂/慢慢听/精听/打下来

内容逐渐清晰一些: 理解结构 钢筋混泥土,无结构怎么盖楼呢 每篇讲座都一定会有自己的结构 否则几分钟,600词以上的内容靠什么组合在一起给你呢 而且任何复杂的东西,理解结构,你就明白了大大半 今天以TPO41 lecture1来看看讲座的其中一种结构 听完了再来看结构哈~ FEMALE PROFESSOR: Many organisms have developed the ability to survive in harsh environ-mental conditions—extreme heat or cold, or, very dry conditions.... Like, plants in the desert—your textbook doesn’t have much about the specif-ics on desert plants, but I think that desert plants are great examples of specialized adaptations to extreme environmental conditions. So with desert plants, there are basically three different adaptive strate-gies. And I should point out that these strategies are not specific to any particular species—many different species have developed each of the adaptations. So, first off, there are succulent plants. There are many different species of succulent plants, but they all can absorb and store a lot of water. Obviously, opportunities to get water in the desert are few and far between. Generally, rains are light and short, so the rain doesn’t seep too far down into the soil… and there's a limited window of time for any plant to get the water before it evaporates. But succulent plants have a spread-out and shallow root system that can quickly pull in water from the top inch of soil, though the soil has to be

相关文档
最新文档