大家一起學發音：[u:]該怎么發

Video Text:

[u:]. This is another back vowel. It's the most closed. Oo. To make this, my tongue comes up just a little bit in the back, it kind of fattens up. Oo. So, the tip of my tongue is not at the front of my teeth. And the lips, of course, come in. Oo. Side shot: oo. Ah, uh, oh, oo.

[u:]又是一個后元音，它是開口最小的一個音。Oo. 發這個音時，舌頭只是在舌根處略微抬起，有些攤平。Oo. 所以，舌尖并不碰到門牙。另外嘴唇當然要向內聚攏。Oo. 從側面對比一下：oo. Ah, uh, oh, oo.

Sample words:

new

新的

shoe

鞋

Timbuktu

通布圖

Sample sentence:

Who flew through the blue sky?

是誰飛越了藍天？