Most dogs will not attack unless provoked.

大多数狗受到挑衅才会攻击。

《牛津词典》

A description of audience behavior that implies viewers are unlikely to change channels unless Provoked by very unappealing programming.

形容受众行为。指除非看到很厌恶的节目，观众一般不会更换频道。

youdao

I stopped for a moment and thought about it because my wife wouldn't email me this unless something had provoked her to do so.

我停下来，思考了一会儿，因为我妻子是不会平白无故发这些问题给我的。

youdao

His father, Robert, said he did not know his son to be violent unless provoked, and even then he was likely to "turn the other cheek".

BBC: Florida judge sets George Zimmerman bail at $150,000

"I've never known him to be violent at all unless he was provoked, and then he would turn the other cheek, " Robert Zimmerman testified.

CNN: Zimmerman apologizes as judge sets $150,000 bond

But Dr Cochran said he thought the risk of Iraq using chemical weapons on the battlefield was low unless the US or the UK provoked it.

BBC: UN 'not looking in right places'