Video Text:The [ju:] diphthong.This combines the y,y,uh-y,Y consonant sound with the oo,closed oo.Ew,ew.As you can see,the lips come in and round.The tongue also shifts.On the y,it's like that,up against the teeth,y,y,the bottom teeth,and it then shifts:yy-oo,ew.So it comes away from the front a little bit because in the oo vowel it's fattening up a little bit in the back,which means there's not as much tongue to have room to curl a bit like that against the teeth.So though it is still touching the teeth,it comes back like that.Ew,eeew.[ju:]是一个复合元音,由辅音y,y,uh-y 连接oo构成,发woo时口型紧缩.Ew,ew.正如你所见,发音时嘴唇是向内聚拢成圆形的.舌头同样有变化.发y这个音的时候,舌头是这样顶住牙齿,y,y,是顶住下边的牙齿,然后它开始移动：yy-oo,ew.舌头从口腔前部略微移开,因为在发元音oo时,舌头会在口腔后部平展,也就是说舌头卷曲起来顶住牙齿的部位会减少.所以说虽然舌头仍然触及牙齿,它却是在向后移动.
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