没人真正知道为什么。
No one really understands why.
youdao
没人知道我失去了我最后一个真正的朋友。
No one knows I lost my last real friend.
没人知道他真正想干什么。
No one knew what he really wanted to do.
没有人真正知道长城有多长，没人知道它是沿着什么路线来修的。
Nobody really knows how long it was or what route it followed.
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