HSK 7-9
可乘之机
kěchéngzhījī(idiom) an opportunity that someone (usually a villain or adversary) can exploit
漏洞会给骗子留下可乘之机。
Lòu dòng huì gěi piàn zi liú xia kě chéng zhī jī.
A loophole gives scammers an opportunity to exploit.
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Appears across levels (7-9) in the HSK 3.0 word list.