water parting line

例句：

1. 1. The water parting line marks the beginning of the river.
   这条河流的分水岭标志着它的开始。
2. 2.The boundary between two countries is marked by a water parting line.
   两个国家之间的边界由一条分水岭来标记。
3. 3.The divider has been used to separate the land from the sea for centuries.
   这个分界线自古以来就被用来将陆地与海洋分隔开来。