洒水车的英文是 "water truck"。

它的来源是由于洒水车的主要用途是将水洒在道路上，以保持道路清洁干燥。

一些英文例句如下：

The city has deployed water trucks to spray the streets and keep the dust down.

We need to refill the water truck before it can start spraying the fields.

The water truck is coming to spray the playground, so everyone needs to move away from the equipment.