英语翻译：
line of defence
例句：
- 拂晓时敌人向我防线开了火。
The enemy opened fire on our lines at early dawn.
- 部队进攻敌军防线。
The troops charged (at) the enemy lines.
- 在环形防线上已布置了几处岗哨。
Guards had been posted at several points around the perimeter.
分词翻译：
防的英语翻译：
defend; guard against; prevent
线的英语翻译：
clue; line; string; stringy; thread; tie; verge; wire
【医】 line; line Of occlusion; linea; lineae; lineae poplitea; mito-; nemato-
soleal line; strand; thread
【经】 line