Any porous material, as sand, cloth, etc., used for clearing or purifying liquids by straining.

过滤材料(如沙、细布等)。

An apparatus so used; a strainer.

滤水器。

Device for clearing or purifying liquid or gaseous substances by filtering.

过滤器；滤净器。

Colored gelatine or glass mounted in front of a lens to control color balance or light intensify.

【摄】滤光镜。

To purify, as a liquid.

过滤；滤清。

To pass or be strained through a filter.

过滤。

To come or go in small units over a period of time.

通过；透出；渗入。

(Of an idea) to become gradually known.

逐渐为人所知。