tooth是可数名词，其复数形式是teeth，tooth作名词时，有牙齿，齿状物，嗜好等意思；tooth作动词时，有咬，将…切成齿状，啮合等意思。
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。
He chipped off a piece of his tooth.
他锛缺了一点牙齿。
水利万物而不争,
而万物莫能与之争。
