拼音：chū qí bù yì，gōng qí wú bèi
注音：ㄔㄨㄑㄧˊㄅㄨˋㄑㄧˊㄨˊㄅㄟˋ
解释：原指出兵攻击对方不防备的地方。后亦指行动出乎人的意料。
出处：语出《孙子·计》：“攻其无备，出其不意。”
英语：do what somebody doesn't expect and strike when he is unprepared
The place where the enemy is not prepared to attack. Later, it also means that the action was unexpected.
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