The miseries I went through made me suddenly realize with a blinding flash what life was all about.

我所经受的苦难令我豁然顿悟生命的意义。

《柯林斯英汉双解大词典》

Suddenly there was a flash of light and Tom came tearing by him, "Run!"

突然，一道灯光闪过，汤姆飞快地从他身边跑过：“快跑！”

youdao

A flash mob is a group of people who come together suddenly in a public place, do something unusual for a short period of time, and then quickly break up.

快闪族，是指一群人突然在公共场所聚集，在短时间内做一些不寻常的事情，然后迅速散开。

youdao

Suddenly Sylvie's dark gray eyes caught a flash of white that grew larger and larger.

VOA: special.2010.04.03

Suddenly a flash of fur, a low growl, and a leopard sprung across our path, leaping atop a hulking solitary boulder.

BBC: The Serengeti in the off-season

Most Americans are more concerned about the games on their iPhone, the NFL labor strike, and assorted other bread and circuses, than the very real prospect that our 235-year-long narrative of increasing dominance could be suddenly over in a flash should we default or come close to defaulting on our debt.

FORBES: The Crotty Plan: Cut 25% Off the Federal Budget Now

The conversation was over in a flash, but I suddenly felt quite different about Al Gore.

WSJ: Excerpt: From the Letters of George H.W. Bush