Pipe smokers sometimes wear down the tips of their teeth where they grip their pipes.
抽烟斗的人用牙齿咬住烟斗，有时会把牙齿尖磨平。
刷刷牙，上和下。
My PALS clean their teeth up and down.
我的朋友们刷牙一上一下的呢。
She came down to breakfast in a hurry, not having brushed her teeth.
她匆匆忙忙地下楼吃早饭，连牙也没刷。
刷我的牙齿，上上下下。
Teeth are a means to break down food or knowledge.
牙齿意味着分解食物或知识。
Draw an animal of any kind and write down its nose, mouth, ears, teeth, etc.
在一张纸上画任何一种动物，并用英语写上那儿是鼻子，嘴。耳朵，牙齿等。
Draw an animal of any kind and write down its nose, mouth, ears, teeth, etc.
在一张纸上画任何一种动物，并用英语写上那儿是鼻子，嘴。耳朵，牙齿等。
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