Jack would not have hit the boy without provocation.

如果不是那个男孩挑衅,杰克是不会打他的.

《简明英汉词典》

The enemy attacked the city, and started killing people without provocation.

敌军攻入城池, 展开了丧心病狂的屠杀.

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Twelve years ago, Iraq invaded Kuwait without provocation.

十二年前, 伊拉克无缘无故侵占科威特.

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They sting or bite without provocation.

它们无缘无故又叮又咬.

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