“有机可乘”，汉语成语，意思是有机会可以利用，有空子可钻。可以翻译为“there's an opportunity to take advantage of; there's a loophole that can be used; have a loophole to exploit”。

例句：

不能让敌人有机可乘。

Don’t give the enemy a chance.

但往往正是人类的弱点让黑客们有机可乘，得以轻松盗取账户。

But more often than not, it is human weaknesses that give hackers the simplest route to compromising accounts.