The soldiers broke through the enemy's defence works.

战士们攻破了敌人的防御工事.

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We constructed two tiers of defence works. When the enemy attacked, we got into the tunnels.

我们挖两层工事, 敌人攻上来, 我们就进地道.

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Who found the maps of the British army's defence works?

谁发现了英军防御工事图.

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