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," Daniel responded.
“没有人知道会在哪一天。”丹尼尔回答。
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 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。
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？
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。
No one knows for sure when people started using metal coins for money.
没人确切的知道人们从何时起开始使用金属硬币作为货币。
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。
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 what that only sea is and when the torrent is going to empty into it.
这唯一的海是什么，而且什么时候它才可以流到这海里，就没有人确定地知道了。
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。
But no one knows for sure when or why it began to symbolise peace. There is probably a connection with ancient Greece.
但无人确切知道在什么时候、或者是什么原因橄榄枝成了和平的象征，这有可能与古代希腊有关系。
No one knows for sure what these creatures mean, but the Moche may have believed the animals would bring healthy harvests.
没人知道这些图案的确切意义，但莫希人深信这些动物能带来大丰收。
No one knows for sure how a word for something to eat also came to mean something very small. But, a peanut is a very small food.
没有人确切地知道一个表示食物的单词，怎么会逐渐变成表示很小的东西。但是，花生就是一种很小的食物。
The theatened primates could possibly adapt to the global warming-induced changes by changing their diets, but no one knows for sure.
虽然濒危的灵长类动物可能会改变自己的饮食，从而适应全球变暖所引起的一些列变化，但是谁又能知道呢？
No one knows for sure how serious each of these dangers will be. But one thing they have in common: they do not respect state frontiers.
谁也不能确实知道，这每一种危险到底有多么严重。但是我们知道，这些危险有一个共同点：它们都是不尊重国界的。
No one knows for sure how serious each of these dangers will be. But one thing they have in common: they do not respect state frontiers.
谁也不能确实知道，这每一种危险到底有多么严重。但是我们知道，这些危险有一个共同点：它们都是不尊重国界的。
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