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腹：指前面；背：指后面。前后受到敌人的夹攻。
[be attacked front and rear; be surrounded back and belly;be surrounded by the enemy at the front and rear] 前面后背受到敌人夹击 今则脊尾俱摇,腹背受敌,旧地皆失。——《挥麈三录》引王襄檄文
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