Without a warning, tears were all over my face.

不觉间，满脸都是泪水。

youdao

Subjects played a computerized driving game in which the player must avoid crashing into a wall that materializes, without warning, on the roadway.

实验对象玩一款电脑驾驶游戏，在游戏中，玩家必须避免撞上毫无征兆突然出现在路上的墙壁。

youdao

The play continued for a few minutes, and then suddenly, without any warning, Harlequin stopped talking.

戏演了几分钟，突然，哈利昆毫无预兆地停止了说话。

youdao

i took a broom to their country and smashed and sliced without warning without stopping and i smiled all the time i was doing it.

VOA: special.2010.04.18

But without a way to publicize that warning, such information is of little use.

VOA: special.2011.06.07

Suddenly,without warning, a heavy mass of snow dropped down.

VOA: special.2010.05.01

Instead of issuing low level certificates it mistakenly gave out what amounted to "master keys" which could have allowed a bogus site to pretend it was the legitimate version without triggering a warning.

BBC: Google detects fake website ID certificate threat

Creativity is often portrayed as a lightning bolt that strikes without warning, leaving a sudden burst of ideas in its wake.

FORBES: Embracing Creative Failure

Her father bought her one when she was 12, but sold it without warning a few months later.

ECONOMIST: A story of riding and redemption