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。
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。
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。
No one yet knows how to design the software for that.
没有人知道怎样设计软件才能做到有主观意识。
No one knows for certain the origin of the holiday.
没有人确切知道这一节日的来源。
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。
No one person knows exactly the right answer for the future.
没有人确切地知道关于未来的正确答案。
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。
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。
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 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 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 because he died alone.
由于他孤独离世，当时无人知晓。
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。
There are three simple rules for making a smooth landing. Unfortunately no one knows what they are.
要做出好的降落有三个原则，但不幸地，没人知道是哪三个…
There are three simple rules for making a smooth landing. Unfortunately no one knows what they are.
要做出好的降落有三个原则，但不幸地，没人知道是哪三个…
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