dark l的发音

The dark L, as I said, comes after a vowel or diphthong in syllable.
Let’s take for example the word real.
In IPA it is written with the r consonant sound [r], the ‘ee’as in ‘she’[i] vowel sound, and the L consonant sound.
But if I say it slowly, you will notice a fourth sound. Real. And that is this ‘uh’ sound that comes just before the L. It’s these two sounds together that make the dark L.
Uh-l. And this uh sound comes as the tongue is moving into position for the L.
Now in this dark L sound, the tongue tip comes to the roof of the mouth. Not through the teeth.
Real.
And the uh sound happens as the tongue moves into that position.
Real.
This is a photo of four different mouth positions for the L sound.
As you can see in the first two, the tongue actually comes through the teeth.
Number 1 is the L on the word last, and number 2 on the word flew.
In number 3 you can see that the tongue is not coming through the teeth. This is on the word flight.
In this word, the tip of the tongue is touching the roof of the mouth, and the teeth are closed before it opens into the ‘ai’ as in ‘buy’ diphthong [ai].
And in number 4 you see the position of the L in the word fall.
Here the L comes at the end of the syllable, so it is a dark L.
So it has this vowel-like sound that comes, before it and you see this mouth shape, where the lips come in a little bit at the corners, making the uh sound as part of dark L. Here we see a photo of the mouth at rest on the left compared with the light L sound on the right.
Here some of the parts of the mouth are drawn in.
You can see that the soft palate is raised on this sound. As you know from these forward-facing photos, the tongue can sometimes come through the teeth, but not always.
Here, this would show where the tongue does not come
through the teeth, but rather, where it touches the roof of the mouth just where it meets the teeth.
The tongue tip stretches up for this.
But in some of those forward-facing photos, you saw the tongue come through the teeth.
For that the tongue reaches forward and touches just below the top front tooth, showing some of the tongue. Here are both of those tongue positions.
Here we see a different comparison.
Rather than comparing the mouth at rest, this photo compares both parts of the dark L sound.
On the left, you see the vowel-like sound that comes before the L, and on the right you see the L.
In the vowel-like sound, the mouth fattens up towards the middle and fattens slightly as the lips round a bit.
In the second part of the dark L sound the tongue moves forward.
In fact, this vowel-like sound happens as the tongue is moving forward into the final position of the dark L. One other note about this sound.
The L, or light position, where the tongue presses here or here, feels very forward in the face.
But in the dark L where the tongue is moving into position, because some of the action happens further back, the sound tends to feel more here in the face.
LI, light L, uhll, dark L.。