Trench warfare is resorted to when the superior firepower of the defense compels the opposing forces to "dig in" so extensively as to sacrifice their mobility in order to gain protection.
当防守方的优势火力迫使敌方广泛“掘壕”，以牺牲机动性来获得防护力时，就会发生堑壕战。
Trench warfare is resorted to when the superior firepower of the defense compels the opposing forces to "dig in" so extensively as to sacrifice their mobility in order to gain protection.
当防守方的优势火力迫使敌方广泛“掘壕”，以牺牲机动性来获得防护力时，就会发生堑壕战。
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