water parting

例句：

1. 1. The rainwater is being used for irrigation in the farmland.
   雨水正在被用于农田灌溉。
2. 2.The water parting between the two rivers is quite significant.
   两条河流之间的水分离相当显著。
3. 3. The separation of water molecules is a fundamental principle of chemistry.
   水分子的分离是化学的一个基本原理。