He was a great and valued personal friend whom I've known for many years.
他是个非常好的、很宝贵的私人朋友，我们已相识多年。
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。
Known for many years this beautiful place, with heavy solicitation enthusiasm we go.
这个享誉多年的秀美之地，用沉甸甸的热情邀约我们前往。
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。
I have known the place for many years.
我已经知道这地方许多年了。
We have known each other for many years.
我们已经认识很多年了。
I've known the place for many years.
我了解这个地方已经许多年了。
We have known each other for many years.
我们认识许多年了。
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！
We had known each other for many years.
我们认识许多年了。
I've known her for many years.
我已经认识她好几年。
I've known him for many years.
我认识他有许多年了。
I've known him for many years.
我认识他有许多年了。
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