A：I have a terrible toothache.
      我牙痛得厉害。

B：Which tooth is it?
      哪颗牙？

medicine

A：(Pointing) This one here.
      （指指）这一颗。

B：Ah, yes. There’s a big cavity.
      啊，是的。有个大洞。

A：Can you fill it?
      能补吗？

B：I’m afraid not. The tooth is too far gone. It’ll have to be taken out.
      恐怕不行。坏得太厉害了。只好拔掉了。

medicine的反义词

A：Then I might as well have it out now.
      那还不如现在就拔呢。

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B：You’d better wait. The gums are swollen. Take the medicine I prescribe and come back in three days.
      还是等等吧。牙床肿了。吃我给你开的药，三天以后再来。

1. 医学;疗法;医疗
    Medicine is the treatment of illness and injuries by doctors and nurses.

    e.g. He pursued a career in medicine...
           他从事医学。
    e.g. I was interested in alternative medicine and becoming an aromatherapist...
           我对替代疗法非常感兴趣，想做个芳香疗法治疗师。

2. （吞服的）药，药物，药剂
    Medicine is a substance that you drink or swallow in order to cure an illness.

    e.g. People in hospitals are dying because of shortage of medicine.
           由于药品匮乏，医院里的病人濒临死亡。
    e.g. ...herbal medicines.
           草药