-----------------------------------
虫歯， むし歯， 齲歯， むしば
1. tooth decay, cavity, decayed tooth, dental caries
蛀牙，龋洞，龋齿
-----------------------------------
よく， 良く， 善く， 能く， 好く， 克く
1. nicely, properly, well, skillfully, skilfully
2. frequently, often
3. I'm glad that you ..., thank you for ...
4. (you have) quite the nerve to, I don't know how you can ...
恰当地，妥当地，很好地，熟练地，娴熟地；常常，经常
-----------------------------------
痛む， 傷む， いたむ
1. to hurt, to ache, to feel a pain
2. to be injured, to be spoiled (e.g. food), to be damaged
疼痛，酸楚，感到痛楚；受伤，变质（如食物），损坏
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
