It happens at the very beginning of the book.

这事发生在书的一开头。

《牛津词典》

It happens millions of years later.

它发生在数百万年之后。

youdao

I agree with you, as it happens.

我恰恰和你意见一致。

《牛津词典》

It happens more commonly in women,children, the elderly and those who use their voice a lot in their jobs.

VOA: special.2009.09.02

Right? I've allocated a variable, it happens to be a pointer; it's still a variable, who know what's in it, right?

对不？我分配了一个变量，它碰巧是一个指针，它还是一个变量，谁知道它里面是什么？

哈佛公开课 - 计算机科学课程节选

It happens in, I think, April and last year we had Snoop Dogg come perform, so that was really cool.

时间就是在四月份。去年，史努普·道格还来我们的音乐会表演，场面非常火爆。

校园生活 - SpeakingMax英语口语达人

Elissa says she'd love to meet the right man, but it will happen when it happens.

BBC: China's 'leftover women', unmarried at 27

As it happens, this nine-year-old fund has averaged a real annual return of 0.34%.

FORBES: Rational Expectations

As it happens, her new album, Don't Hurry For Heaven, also just came out.

NPR: Paul Curreri And Devon Sproule: A Couple Of Solo Artists