No one knows for sure what happened.
谁也不知道究竟发生了什么事。
No one knows for sure why adolescence is unique to humans.
没人确切知道为什么青春期是人类独有的。
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 because he died alone.
由于他孤独离世，当时无人知晓。
No one knows for sure what happened to her.
没有人确切地知道她出了什么事。
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. That's the great mystery!
没有人知道，这是个大秘密！
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。
No one knows for sure why Ferreira survived the radiation.
没有人确切知道为什么费雷拉辐射后能幸存下来。
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。
Many greater powers might reside here, but no one knows for sure.
也许有许多上位神明居住在这儿，谁知道呢？
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。
Whether they can accurately forecast things, no one knows for sure.
他们能否准确预测事物肯定还没人知道。
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。
But no one knows for sure why America's obesity has trebled since 1960.
但是没有人能确切的知道为何美国的肥胖率自1960年开始猛增了3倍。
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。
Msangi says no one knows for sure, but he fears they may rise even higher in coming years.
姆桑吉说没人能说得清楚，但是他担心在未来几年内，价格可能会升的更高。
No one knows for sure, but it is probably about 140 degrees below zero Celsius on this ninth planet.
没有人确切知道，但估计这第九个行星上的温度大约是摄氏零下140度。 收藏。
No one knows for sure how well cash and other big-ticket rewards work in education over the long haul.
没有人能够确切知道在长期范围内现金和高价奖品能够在对教育产生多大的作用。
Women are three times as likely to become depressed as men. No one knows for sure why this is the case.
女人压抑的几率是男人的3倍，没有人能确确地解释原因。
No one knows for sure why a domestic cat purrs, but many people interpret the sound as one of contentment.
没有人知道为什么一个家猫发出咕噜咕噜的声音，但许多人解释声音作为一种满足感。
Conodonts lived in the Cambrian seas, and may have eaten certain types of plankton, but no one knows for sure.
牙形刺生活在寒武纪的海洋中，可能以某种浮游生物为食，不过没人清楚具体情况。
No one knows for sure what your health may be in the future, but why not give yourself the best chance possible.
没人能肯定你将来的健康状况怎样，但何不现在就给自己最好的拥有健康的机会呢。
Social phobia sometimes runs in families, but no one knows for sure why some people have it, while others don't.
有些社交恐惧症是家族遗传，但没有人能真正说清楚为什么有些人有而有些人又没有。
Social phobia sometimes runs in families, but no one knows for sure why some people have it, while others don't.
有些社交恐惧症是家族遗传，但没有人能真正说清楚为什么有些人有而有些人又没有。
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