有机可乘 Opportunity to take advantage of
Explanation
指有可乘之机，有空子可钻。比喻有可以利用的机会。
It means there is an opportunity to exploit, a loophole to exploit. It is a metaphor for the opportunity to take advantage of opportunities.
Origin Story
话说三国时期，诸葛亮巧妙地利用魏国的内乱，成功地取得了街亭之战的胜利。魏军内部矛盾重重，将领之间互相猜忌，为蜀军有机可乘。诸葛亮看准时机，派兵奇袭，打得魏军措手不及，最终取得了决定性的胜利。这个故事说明，在斗争中，善于观察和把握时机，寻找对手的弱点，才能有机可乘，最终取得胜利。
During the Three Kingdoms period, Zhuge Liang cleverly used the internal chaos of the Wei Kingdom to achieve victory in the Battle of Street Pavilion. Internal conflicts and mutual suspicion within the Wei army gave the Shu army an opportunity. Zhuge Liang seized the opportunity, launched a surprise attack, caught the Wei army off guard, and achieved a decisive victory. This story illustrates that in a struggle, one must be good at observing and seizing opportunities, identifying the enemy's weaknesses, in order to exploit any advantage and ultimately achieve victory.
Usage
通常作谓语、定语、宾语；指可以利用的机会。
Usually used as predicate, attributive, and object; refers to opportunities that can be utilized.
Examples
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这次的谈判，对方故意给我们制造了一些难题，企图有机可乘。
zheci de tanpan, duifang guyi gei women zhizao le yixie nan ti, qitu you ji ke cheng.
During the negotiations, the other party intentionally created some difficulties for us, attempting to exploit any opportunities they could find.
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他发现公司管理存在漏洞，于是便有机可乘，从中获利。
ta faxian gongsi guanli cunzai lou dong, yushi bian you ji ke cheng, cong zhong huoli。
He discovered loopholes in the company's management and took the opportunity to profit from them..