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。

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

youdao

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。

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

youdao