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Why are you doing this? I just felt like running.
VOA: standard.other
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You say, well, why are you doing something so foolish?
你会说,你为什么在做那么傻的事啊?
麻省理工公开课 - 固态化学导论课程节选
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if you are doing something that you hate and you are not happy, why bother?
如果你做自己讨厌的事情,就会不高兴,何必呢?
怡人的的汉普斯特德 - SpeakingMax英语口语达人