youdao

Any doubts had long since been swept away.

一切怀疑早已完全消除。

《牛津词典》

It is so long since I have seen him!

我很久没见到他了！

youdao

And their original meanings are long since forgotten.

VOA: special.2010.02.14

You've read at this point, long since, Tolstoy's Death of Ivan Ilych.

你们很久以前就读到过这个观点，托尔斯泰的Ivan，Ilych之死。

耶鲁公开课 - 死亡课程节选

It's been a really long time since I have personally followed basketball.

我个人看篮球真的已经很久了。

现场观看篮球赛 - SpeakingMax英语口语达人

If there are any such doubts for Ms. Chen, she has long since erased them.

WSJ: Inside the Amway Sales Machine

But that was then, and the goal of the law has long since been realized.

WSJ: The Weekend Interview with Abigail Thernstrom: The Good News About Race in America

Indeed, it has long since ceased to be of central importance even to the local area.

ECONOMIST: Industry