中英成语俚语800对162：攻其不备

　　攻其不备
 

　　take one off his guard.

　　to catch a weasel asleep.

　　eg：the sudden attack took the enemy napping and ran.

　　中英俚语俗语来源：孙子·计篇："攻其不备，出其不意。"

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