无间可乘 | leaves no exploitable loophole

wú无jiān间kě可chéng乘

Leaves no loophole or weak point that can be exploited; impregnable.

公司的安全系统设计得无间可乘，任何未经授权的访问都会立即被发现。

The company's security system is designed to leave no loophole, and any unauthorized access will be immediately detected.

Era:

Ancient

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