tunnel defences
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但他承认，激进分子仍然从地道网络以及防御工事内进行顽抗。
But he acknowledged the militants had been offering stiff resistance to his soldiers from their network of tunnels and fortified compounds.
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我们挖两层工事，敌人攻上来，我们就进地道。
We constructed two tiers of defence works. When the enemy attacked, we got into the tunnels.
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