Without a warning, tears were all over my face.

不觉间，满脸都是泪水。

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