动词短语
中文翻译：挖掘战壕
同义词：
['挖掘战壕，建立防御工事，构筑防线']
例句：
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1. The soldiers dug trenches to defend the city.
士兵们挖掘战壕来保卫城市。
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2. The army built a strong defensive position in the mountains.
军队在山区建立了坚固的防御阵地。
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3. The enemy launched an attack, but our troops quickly dug their trenches and counterattacked.
敌人发动了进攻，但我们的军队迅速挖掘战壕并进行了反击。