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“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.