Threading, for example, has frailties that have been known for many years.
举例来说，线程存在很多年来人们已经知道的脆弱性。
He is known to have been working on the problem for many years.
大家都知道他在这个难题上已经工作了许多年了。
We have known each other for many years.
我们已经认识很多年了。
We have known each other for many years.
我们认识许多年了。
I have known the place for many years.
我已经知道这地方许多年了。
She is known to have been working on the problem for many years.
我们知道她研究这问题有好几年了。
She is known to have been wreaking on the problem for many years.
众所周知她为这个问题发了很久的火！
She is known to have been wreaking on the problem for many years.
众所周知她为这个问题发了很久的火！
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