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 what happened.
谁也不知道究竟发生了什么事。
No one really knows how many different faces someone can recall, for example, but various estimates tend to hover in the thousands—based on the number of acquaintances a person might have.
例如，没人确切地知道一个人究竟能记住多少张不同的面孔，但是各类评估倾向于几千张上下——依据一个人可能相识的人数来判断。
They've asked every animal, too, for miles around, and no one knows anything about him.
他们问了方圆几里的所有动物，可是没有人了解他的情况。
No one knows what she might be doing now, but not washing up, that's for sure.
没人知道她现在在干什么，但肯定不是在洗餐具。
One thing is for sure, if or when the U.K. leaves the EU, it will erect new logistical and economic barriers, and no one knows how divisive they will be.
有一件事是肯定的，如果或当英国离开欧盟时，英国将会建立新的物流和经济障碍，没有人知道这些障碍会造成多大的分歧。
According to Peter Sandiford of the Liverpool School of Tropical Medicine, no one knows for certain.
据利物浦热带医学院的彼得·桑迪福德说，没有人确切地知道。
No one knows if Spot will stay after the pandemic is gone, but one thing is for sure: the robot is the hardest working dog in the world.
没人知道疫情结束后斯伯特会不会留下，但有一件事是肯定的：这个机器人是世界上最勤奋的工作者。
We've tried this method for no one knows how many times.
这种方法我们已不知试了多少次。
But there are still hundred, maybe thousands, of disease blind spots around the world - where no one knows what they have to watch for, or what they must report.
但是全球仍存在着上百，或许是上千的疾病盲点，在那里人们不知道他们必须注意什么，或者他们必须报告什么。
I might get up, but if I got up and looked at it, ten to one I shouldn't be able to say for certain; because once a thing's done, no one ever knows how it happened.
我本来可以站起来，但是，即使我站起身来瞧瞧它，十之八九我也说不出它到底是什么；因为一旦一件事发生以后，就没有人能知道它是怎么发生的了。
No one knows whether the phenomenon holds true for other animals.
没人知道是否这个现象对其他动物也奏效。
But if you just say "did tech support for a software company" no one knows you did a good job.
不过如果你只是说“为一个软件公司做技术支持”，没人会知道你做的很优秀。
The brain has been mapped to the smallest fold for at least a century, but still no one knows how all the parts talk to each other.
早在一个世纪以前大脑中那些最微小的折叠结构也已经被描绘出来，但对于大脑中各个部分间如何通讯仍一无所知。
US Airways pilots can drill for water landings in a simulator, but no one knows how realistic that is.
美国航空公司的飞行员在模拟器上训练过水面降落，但没有人知道实际情形是怎样。
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。
So what is an innovator's approach when no one knows for sure what customers will do with an innovation because they haven't seen it before?
因此，一位创新者的方法就是当没有人确切知道客户将做什么时他做了，因为他们不能到未来去看看。
Underground lending solves a huge problem for private companies. But no one knows exactly where all that credit is really going - and nobody seems able to control it.
地下借贷解决了私营企业的一个大难题，但没有人知道这些借出去的钱去了哪里，也没有人能够控制这些钱的流向。
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。
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。
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, which makes taking sides a dangerous guessing game, particularly for the White House.
没有人知道，这让双边对话成为一场危险的猜谜游戏，特别是对白宫而言。
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。
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 what the consequences will be but the uncertainty unsettles those whose livelihoods may be at risk from the mainland's millions of underpaid workers.
没有人确切知道后果将是什么，但是生计可能被大陆数百万的低收入的工人影响到的人们惶恐不安。
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。
Your skills and work ethic may not be questioned as thoroughly as they would be when applying for a job where no one knows you.
当你去一个没人认识你的地方求职时，你的工作技能和信条不太会被重点问到。
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。
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。
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