dividing line

基本解释

Troops were disengaged from the dividing line.
双方军队在分界线脱离了接触。
Just think of that day as a dividing line between the smoking you and the new and improved nonsmoker you'll become. Mark it on your calendar.
把那一天当做你从一个吸烟者变成一个全新的进步的无烟者得分界线，把那天从日历上标记下来。
What could be the cause of this strange invisible dividing line that skims across south-west France, cuts through Italy close to Florence, and continues eastwards through the middle of the Black Sea?
是什么原因导致这条奇怪的无形分界线跨越法国西南部，穿过意大利、接近佛罗伦萨，又继续向东穿过黑海中部？

There is a clear dividing line between Labor and the Liberal Democrats on the one side and the skeptical Conservative policy on Europe on the other.
H.K.Suh from the group Korean Americans for Peace said he believes a drawdown of U.S.troops everywhere, including on the dividing line between the two Koreas, would be beneficial to the United States.
The Greek Cypriots canceled the latest session Thursday after Turkish Cypriot authorities held up a bus convoy of Greek pilgrims for lengthy security checks as they sought to cross the dividing line between the communities.

Smart companies today understand that there is no dividing line between traditional and social media.
FORBES: Brand Passion Beats "Liking"

A dividing line is a distinction or set of distinctions which marks the difference between two types of thing or two groups.
The dividing line between two areas is the boundary between them.