why dont you smile
你为什么不微笑呢?
以上为机器翻译结果，长、整句建议使用 人工翻译 。
I dont know why I did that. Perhaps it was nervousness, perhaps it was because, when you get very close, one to another, it is very hard not to smile.
我不知道自己为何又这般反应，或许是过于紧张，或许是当你如此靠近另一个人，你很难不对他微笑。
youdao
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