filter

我需要为我的咖啡机买一个新的过滤器。

I need to buy a new ___filter for my coffee machine.

水族箱的水过滤器需要每月清洗。

The aquarium's water ___filter needs cleaning every month.

工程师在将废水排放到河流之前进行过滤。

Engineers ___filter the wastewater before releasing it into the river.