水利系的英文：
Department of Water Conservancy

A government department or a subdivision of a department.
局司处等行政单位政府部门或其下属机构

He's the departed department leader.
他是过去的部门领导。

The bulk of the work rolls from department to department.
大量的工作从一个部门转移到另一个部门。

In smooth water
进入顺境

Is the water on or off?
自来水龙头开着还是关着？

Water Skiing is a surface water sport.
滑水是一项水面运动。

conserve momentum
使动量守恒

Conservation is of the utmost importance.
保护自然资源至关重要。

We are not creatures of the Conservative government.
我们不是保守派政府的傀儡。