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馬鹿なことをする， ばかなことをする， バカなことをする
1. to do a silly thing, to do something stupid
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良い， 好い， 善い， 佳い， 吉い， 宜い， よい， えい
1. good, excellent, fine, nice, pleasant, agreeable
2. sufficient, enough, ready, prepared
3. profitable (deal, business offer, etc.), beneficial
4. OK, all right, fine, no problem
5. easy to ...
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笑う， 嗤う， 咲う， わらう
1. to laugh
2. to smile
3. to sneer, to ridicule
4. to be dumbfounded, to be flabbergasted
笑；微笑；冷笑，嘲弄；冷笑，嘲弄
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
