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1·Her angry outburst was totally unprovoked.

她的暴跳如雷完全是无理取闹。《牛津词典》

2·The half-truth is “unprovoked”.

“无缘无故”只能说是半真半假。

3·They said the attack had been unprovoked.

他们说那次攻击是无缘无故的。

4·This malicious and unprovoked attack astounded him.

这个恶意的无端攻击使他吃惊。

5·Epilepsy is defined by two or more unprovoked seizures.

癫痫是指两次或两次以上的无端发作。

6·They can become suddenly irritable or explosive, even when unprovoked.

即使在无任何原因时，他们也会变的易怒或爆燥。

7·Result is really efficacy: down the stairs, unprovoked was pushed from behind a.

结果真的灵验了：下楼梯时，无缘无故被人从后面推了一把。

8·Conklin said the attack was unprovoked, and he described it as brutal and lengthy.

克林说这次攻击毫无理由，他形容这次攻击“残酷而漫长”。

9·Several fatal unprovoked attacks in the United States alone have occurred over the years.

近年来，在美国已经发生了几起人们无缘无故受到鲨鱼攻击的事件。

10·If Japan attacked the US unprovoked, Germany and Italy would have no obligation to attack.

也就是说，如果日本毫无缘由地攻击美国，德国和意大利没有义务参与对美作战。

无故的

1·The attack appeared to be unprovoked and it is thought the killer did not know his victim.

此次袭击看似一起无故发生的事件，并且据说凶手并不认识遇害者。

2·Several fatal unprovoked attacks in the United States alone have occurred over the years.

近年来，在美国已经发生了几起人们无缘无故受到鲨鱼攻击的事件。

3·The half-truth is “unprovoked”.

“无缘无故”只能说是半真半假。

4·Work in a bank trouble force, good hope someone can help me a hand. Result is really efficacy: down the stairs, unprovoked was pushed from behind a.

在银行工作不太顺力，好希望有人能助我一臂之力。结果真的灵验了：下楼梯时，无缘无故被人从后面推了一把。

5·They said the attack had been unprovoked.

他们说那次攻击是无缘无故的。

无端的

1·Epilepsy is defined by two or more unprovoked seizures.

癫痫是指两次或两次以上的无端发作。

2·They are often depicted by media, particularly in films, as the proponents of massive brawls and unprovoked violence.

他们往往是被媒体描述的，特别是在电影，作为支持者的大规模斗殴和无端的暴力行为。

无缘无故的

1·I ask that the Congress declare that since the unprovoked and dastardly attack by Japan on Sunday, December seventh, a state of war has existed between the United States and the Japanese Empire.

我问国会声明自从日本的无缘无故和懦夫的进攻以来星期日，十二月第七日，一种战争状态已在美国和日本的帝国之间存在。

2·Result is really efficacy: down the stairs, unprovoked was pushed from behind a.

结果真的灵验了：下楼梯时，无缘无故被人从后面推了一把。