During this period, there was an average of sixty-three attacks worldwide each year.

在这一个时期，世界范围内平均每年有63起鲨鱼攻击。

youdao

During this period, there was an average of sixty-three attacks worldwide each year.

在这一个时期，世界范围内平均每年有63起鲨鱼攻击。

youdao