However since it has been 69 years after the last renovation no one know for sure the exact data.
但是太和殿上一次重建距此时已六十九年，没有人知道建造大殿的具体数据。
This fear mechanism is critical to the survival of all animals, but no one can say for sure whether beasts other than humans know they're afraid.
这种恐惧机制对所有动物的生存都至关重要，但没有人能肯定人类以外的动物是否知道自己在恐惧。
The one thing I know for sure is that I cannot get those hours of my life back, and that there is no point wasting more time by dwelling on it.
有一件可以确定的是我不能将生命中的这些时间追回来，然后对这还念念不忘是没有意义的。
You know one thing for sure, no matter how well you do your job no one is going to reward you for it.
你要相信一件事，不管你工作如何出色，没人会给你奖赏。
No one seems to know for sure what it was that everyone saw in the sky.
似乎没有人知道这是什么，每个人都看到天空中。
In the absence of a more straightforward count, no one could know for sure what the demographics are.
由于缺乏更直接的统计方法，无人知晓人口组成状况到底怎样。
No one will ever know for sure, but what we do know is that she took part in one of the greatest adventures in the 19th century.
没有人能确切晓得，但是我们所晓得的是，她参加了一个伟大的冒险在第十九世纪。
No one will ever know for sure, but what we do know is that she took part in one of the greatest adventures in the 19th century.
没有人能确切晓得，但是我们所晓得的是，她参加了一个伟大的冒险在第十九世纪。
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