It is a common knowledge that we are the hope of this era.
都说了，我们是这个时代的希望啊！
It is common knowledge that WCF is a very powerful technology.
这是众所周知，WCF是一个非常强大的技术。
It is common knowledge (among the teachers) that they will soon have a new headmaster.
老师们都知道他们将迎来一个新的校长。
It is common knowledge (among the teachers) that they will soon have a new headmaster.
老师们都知道他们将迎来一个新的校长。
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