This malicious and unprovoked attack astounded him.

这个恶意的无端攻击使他吃惊。

youdao

An unprovoked attack means the person is alive when bitten. The person is in the shark's environment.

一个“不被激起”攻击意谓这个人当他被咬后还活着。

youdao

US man is in custody after he bit a pet python in what California police said was an apparently unprovoked attack.

一美国男子因咬了一条宠物蟒蛇而被关押，而且据加州警方称他咬蛇根本是无缘无故。

youdao

An unprovoked attack means the person is alive when bitten.

VOA: special.2009.06.16

Israeli Minister of Intelligence, Dan Meridor,said the UNIFIL report proves that the Lebanese Army launched an unprovoked attack on Israel.

VOA: standard.2010.08.04

The International Shark Attack File describes shark attacks as either provoked or unprovoked.

VOA: special.2011.03.15

It was an unprovoked attack in which he was punched repeatedly and knocked unconscious.

BBC: Attacks on Norfolk prison staff revealed

Shea MacLean, 19, from Winchcombe killed Dorothy Shepherd in an unprovoked attack at home in 2010.

BBC: Dorothy Shepherd

But an unprovoked attack is more likely to result in a decision not to insure.

FORBES: The $30,000 Dog: How a Biting Pooch Costs You