It all happened so suddenly.

一切都来得那么突然。

《牛津词典》

Accidents happen so suddenly.

事故的发生都很突然。

youdao

But we were left wondering—what cause the population to increase so suddenly?

但我们不禁想问——是什么导致了人口增长这么突然？

youdao

And I've been hearing a lot about young people who -- you know, they're posting stuff on Facebook, and then suddenly they go apply for a job and somebody has done a search and, so,that's some practical political advice for you right there."

VOA: special.2009.09.14

Pass to the left bank and the scene changes so suddenly that you think yourself on the other side of the world.

而河左岸则完全是另一番景象,让人怀疑自己到了世界的另一头

耶鲁公开课 - 美国内战与重建课程节选

And so suddenly, you are thrown into a pool of so many other incredibly intelligent, driven people, and

所以，突然之间，你发现周围人都是绝顶聪明，都是劲头十足的人，

我遇到的天才们 - SpeakingMax英语口语达人

Question: Why are readers of a business magazine so suddenly interested in diet and fitness?

FORBES: Extreme Fitness For A Hardcore Economy

So suddenly, the light bulb went off with the arrival of home video.

FORBES: D9: Disney To Revamp Web Site With VOD, Subscriptions

T-Dog was never as prominent a figure in The Walking Dead, but it was still a surprise to see him killed off so suddenly.

FORBES: 'The Walking Dead' Review: Because I Could Not Stop For Death