灌水的英文：
irrigation
watering

参考例句：

They watered the thirsty fields.
他们给干旱的土地灌水。

So if you fill your sink up, but leave the plug out, when the water level stops rising, the water in = the water out.
比如你往洗手池里灌水却没把塞子塞上，当水位停止上升的时候，就可以说，流进的水=流出的水。

irrigation是什么意思：
n. 灌溉；冲洗（法）

The rotary agitator irrigated him.
旋转的鼓动者可灌溉的他。

The farmer is irrigating in his field.
那个农夫正在田里灌溉。

The terrace channels are convenient for irrigation.
梯田的沟渠便于灌溉。

What is the irrigation norm?
灌溉定额是多少？

through the growing season by furrow irrigation
在整个生长期间用畦灌法

watering是什么意思：
n. 水；雨水；海水；海域
v. 给…浇水；供以水；加水；流泪；流口水

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。

Please fetch some water to water the flowers.
请你去弄点水来浇花。

Water will flow from their buckets; their seed will have abundant water.
水会从他们的桶里流出，而种子会获得充足的水源。