动词
中文翻译：挖掘壕沟
同义词：
['dig', 'fortify', 'encircle', 'enclose']
例句：
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1. The soldiers dug deep trenches to protect their position.
士兵们挖深沟以保护自己的位置。
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2. The enemy was forced to dig his own trench lines.
敌人被迫挖自己的战壕线。
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3. The engineers were busy encircling the base with a series of earthworks.
工程师们忙于用一系列土工构筑物包围基地。