teeth单数形式是tooth
作名词时意为“牙齿；人名；(英)图思”，
作动词时意为“给……装齿；啮合”。
He's got a front tooth missing.
他有一颗门牙掉了。
Her tooth was extracted under local anaesthetic.
她的牙齿是局部麻醉拔出的。
I've just had a tooth out at the dentist's.
我刚在牙科诊所拔了一颗牙。
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