The [i：] sound is a front vowel， which means it feels more like
it comes from here， than from here ， ah. ee. To make this sound ， the
tongue touches the roof of the mouth， and it is a little more forward
than the midpoint of the tongue ， and same with the roof of the mouth.
Ee. So for me ， it's about that point that touches the roof of the mouth.
Because the tongue is touching the roof of the mouth， the jaw cannot
drop. Ee. And ， as you notice， the sides of my mouth come out just a
little bit. If that didn't happen ， this is what it would look like：
ee， ee. But they do： ee ， ee.

    [i：] 是一個前元音，發(fā)這個音時舌頭要觸及上顎，觸及點對于舌頭和上顎
來說都是它們中線靠前的位置。因為舌頭要碰到上顎，所以下巴不能夠下移。另
外，嘴角一定要稍微向兩側(cè)拉伸。

    Sample words：

    please請

    ski 滑雪