The [u] sound. This is very related to the [？] as in butter， but
there's a difference in the tongue position ， and a difference in the
lip position. What the tongue does， is it comes more forward than it
does for the uh {butter} sound， and it also raises a little bit in the
back. But it doesn't touch the roof of the mouth. Uh， uh. So it comes
up a little bit in the back and then forward. The lips， as you can see
，uh ， they come out a little bit ， and the corners come in just a little
bit. Uh {butter}， uh {full}， uh {butter}， uh {full}. Uh， butter —
— uh ， should ， could， full.

    [u] 的发音与butter一词中[ ？] 的发音非常相近，但是它们在舌头和嘴唇
位置上有所区别。在发[u] 这个音时，舌头的位置比发[ ？] 时更靠前。同时舌
根处略微抬起，但是不触及上颚。[u] ， [u]. 所以说舌跟略微抬起，然后向前
伸展。至于唇形，正如你所见，[u] ，嘴唇稍稍往外张，嘴角也略微往中间收。

    [ ？] ，[u] ，[ ？] ，[u]. [？] ， butter —— [u]， should ， could，
full.

    Sample words：

    full

    充满的

    could

    能

    Sample sentence ：

    You should look at that woman's foot.

    你应该看看那位女士的脚