名詞 tooth:

1. hard bonelike structures in the jaws of vertebrates; used for biting and chewing or for attack and defense
2. something resembling the tooth of an animal
3. toothlike structure in invertebrates found in the mouth or alimentary canal or on a shell
4. a means of enforcement
5. one of a number of uniform projections on a gear

1. This tooth is sensitive to cold.
   這顆牙對冷過敏。
2. He bellowed with pain when the tooth was pulled out.
   牙被拔掉時，他疼得大叫。
3. I was fitted an artificial tooth by the dentist.
   牙醫(yī)給我鑲了顆假牙。
4. Now you know what the job involves here's something to get your teeth into.
   你既然對這項工作已有所了解，有些事就由你去處理吧。
5. We should brush our teeth at least twice a day.
   我們每天應該至少刷兩次牙。