I saw him yesterday, as it happens.; it so happened that I saw him yesterday.

碰巧我昨天看见了他。

《新英汉大辞典》

Now it so happened that the old Frog from Kioto and the "lion's cub" from Osaka started each from his home at the same time.

好了，事情发生得很凑巧，京都的老青蛙和大阪的“小狮崽”同时从各自家中出发了。

youdao

But it so happened that my intention of writing and publishing this comment was never fulfilled.

但是碰巧我撰写和发表这些说明的打算从未实现。

youdao

It happened so early in the flight, at a level of about 900 meters, that the crew had little time to decide what to do.

VOA: special.2009.01.30

That's so basic, it must have happened a million times and that's the basic idea of the stock market.

这是很基础的概念,早已屡见不鲜,而这就是股票市场的最初思想

耶鲁公开课 - 金融市场课程节选

it just so happened that two other people I know from back home transferred the same time I did.

刚好我在家认识的两个人也和我同时转过来了。

留学生的适应期 - SpeakingMax英语口语达人

It so happened that included in the Digital acquisition was a business making tape drives -- descendants of those huge boxes with whirring wheels that used to personify computing in the 1960s.

FORBES: Serendigity

Or is it fair to say that they developed their soccer skill set elsewhere and it just so happened that it matched Barcelona's, which is why the club signed them?

WSJ: Youth Academies: Soccer's Nature vs. Nurture Debate

It just so happened that subprime mortgages were available to leverage that kind of apparent wealth-creation.

FORBES: Would a Gold Standard Have Kept Greg Smith at Goldman?