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it's a mystery why…为什么不用that

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he is always depressed.
yes .it is a mystery why he never smiles .
为什么不用mystery that ?“他从来不笑这件事是个谜“应该比“为什么他从来不笑是个谜”更解释的通吧。。。。
求解答


来自手机贴吧1楼2015-04-15 21:58回复
    the reason he never...is a mystery. / the phenomenon is NOT.


    IP属地:北京来自Android客户端2楼2015-04-15 22:31
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