界线用英语怎么说

分界线 分界线[简明汉英词典][fēnjièxiàn]1. boundary2. division3. great divide

分界线作为比较规范的说法是boundary n.分界线，边界A river forms the boundary between the two countries. 一条河流成了两国的分界线.还有一种就是没那么正式的，divide n.分水岭，分界线； 分配；The time had come to cross the great divide between formality and truth. 是时候跨越形式与真理之间的巨大分界线了

The line that divides the bright and dark.