我们过滤咖啡以去除咖啡渣。

We ___filtered the coffee to remove the grounds.

空气通过HEPA过滤器以去除灰尘。

The air was ___filtered through a HEPA filter to remove dust.

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.