No one knows for sure when or why it began to symbolize peace.
没有人确切地知道它是什么时候或者为什么开始成为和平的象征。
No one knows for sure, of course.
当然谁也不敢肯定是不是马上就会出现崩溃。
但是谁也不敢肯定。
No one knows for sure because he died alone.
由于他孤独离世，当时无人知晓。
No one knows for sure where flags came from.
没有人确切知道旗子从何而来。
No one knows for sure what happened to Bill.
没有人确切知道比尔出了什么事。
No one knows for sure how the Moai came to be.
没有人确切知道毛埃的来历。
No one knows for sure. That's the great mystery!
没有人知道，这是个大秘密！
Or not. This being China, no one knows for sure.
也许不是，这就是中国，没人能确切知道答案。
But no one knows for sure if this is the origin.
但是没人能确定这就是来源。
No one knows for sure what happened to our boss.
没有人确实地知道老板发生什么事。
No one knows for sure what will happen in the future.
没有人确切地知道明天会发生什么。
No one knows for sure why Mr, Gilson has lung cancer.
没有人确切地知道为什么吉尔松会得肺癌。
Extinct no one knows for sure, but a reasonable guess is: us.
但是有一种合理的猜测：我们人类。
No one knows for sure, and making predictions is a risky business.
没有人确切地知道，而且预测是一件冒险的事。
But no one knows for sure when or why it began to symbolise peace.
但是没人能够确认橄榄枝什么时候为什么成为了和平的象征。
No one knows for sure what the world would be like in the year 2001.
没有人确切知道到2001年世界将会是什么样子。
Why it went extinct no one knows for sure, but a reasonable guess is: us.
巨猿为什么会灭绝，没有人确切地知道。但是有一种合理的猜测：我们人类。
Answer: no one knows for sure, but common sense would provide a good guess.
答：没人能确定，但我们可以用常识猜测。
我敢肯定，没人知道原因。
But no one really knows for sure.
但是没人确切知道哪一个是真的。
But no one really knows for sure.
但是没人确切知道哪一个是真的。
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