The court has made a gross mistake in sending an innocent man to prison. 法庭犯了一个严重的错误,将一名无辜的人投进了监狱。
He made a gross mistake but refused to admit it. 他犯了严重的错误却不肯承认。
War has absolutely no way to resolve the antagonism between the two sides. I think it is a gross mistake that we are spending so much money on weapons. 战争绝不能解决两岸的对立,我觉得我们花那么多的钱在武器上是非常错误的。