词典释义：
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Why on earth would we have sex?
我们干嘛要做爱？
《The Big Bang Theory Season 4》《生活大爆炸 第四季》
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Why on earth did you agree to all that?
你到底干嘛要同意那些协议啊？
《The Big Bang Theory Season 3》《生活大爆炸 第三季》
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I asked you to take care of it. Why on earth would you sell it?
我当时让你妥善保管的，你为什么要卖了它？
《Fast & Furious 7》《速度与激情7》
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Sheldon, you're a condescending jerk. Why on earth would I want to do something nice for you?
谢尔顿，你是个傲慢的混蛋，我干嘛要帮你这种人的忙呀？
《The Big Bang Theory Season 5》《生活大爆炸 第五季》
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Tony! Why on earth are you here? Did you leave something behind? No, I had some business nearby, so I thought I'd look in.
托尼，你怎么来了落下什么东西了吗？不 ，我在附近办事， 就想过来看看。
《Downton Abbey Season 4》《唐顿庄园 第四季》
双语例句
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Though why on earth you should want to have a Banquet in the morning I cannot understand.
虽然我不明白你到底为什么要在早上举行宴会。
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Why on earth should their beds be properly aired, seeing that they left them in such a thankless hurry?
既然他们是这样匆匆忙忙地走了，连吃力不讨好也不知道，为什么要帮他们把床铺晒干呢？
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And why on earth could that be so?
但这究竟是为什么呢？
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Why on earth did you tell Lisa?
你搞什么，已经告诉丽莎？
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Why on earth should I knit him socks?
我凭什么要给他织袜子呢？