a struggle (usually prolonged) between competing entities in which neither side is able to win;
"the hope that his superior campaigning skills would make a difference evaporated in the realization that electioneering had become a form of trench warfare"
a type of armed combat in which the opposing troops fight from trenches that face each other;
"instead of the war ending quickly, it became bogged down in trench warfare"
Instead of the war ending quickly, it became bogged down in trench warfare. 冲突不但没有很快结束，而且还加剧成为堑壕战。
The hope that his superior campaigning skills would make a difference evaporated in the realization that electioneering had become a form of trench warfare. 意识到选举活动已成为一种堑壕战，他的通过出色的竞选技巧来制造差距的希望化为了泡影。
