把你的舌头放在牙齿后面，微笑，这样可以放松你的脸部。

Put your tongue behind your teeth and smile, which will relax your face.

youdao

非常明显，前面的牙齿先改变，后面的牙齿再改变。

Apparently front teeth changed first, back teeth later.

youdao

这些早期翼龙嘴里都长满了牙齿，通常来说，小的牙齿长在后面，大的牙齿长在前面。

These early pterosaurs all had a mouth full of teeth, usually small at the back and larger at the front.

youdao