demarcation line造句

1、Curzon line: Demarcation line between Poland and Soviet Russia.
寇松线：波兰和苏俄之间的边界线。

2、Where is the fine demarcation line between Love and Friendship?
哪里是友谊和爱情的细微分野？

3、There is no demarcation line along the Yalu River.
鸭绿江是没有界线的。