When you see water coming off the roof, you will know that the tank is full.

当看见有水从屋顶流下的时候，你就知道水箱满了。

youdao

In the middle of the roof is an air layer which is cooled and cleaned automatically by water spraying system linked to the rainwater collection tank.

屋顶的中部是通风口，通过连接雨水收集池的水喷淋装置自动化控制，实现冷凝和净化。

youdao

These are mounted on the roof and provide solar power to drive the pumps necessary for circulating the water over the roof and back to the tank beneath the building.

光电板斜放在屋顶，它提供足够的太阳电能带动抽水帮浦能够让水经过屋顶回到大楼下面的水箱里循环。

youdao