Filter: n. A porous material through which a liquid or gas is passed in order to separate the fluid from suspended particulate matter.
用于过滤的材料：可通过液体或气体的多孔性物质，以便从悬浮物质中分离液体vi。
Total suspended particulates include fine particulate matter called PM2.5 ― particles with diameters of no more than 2.5 micrometers.
总悬浮粒子包括被称为PM2.5的细颗粒物，即直径不超过2.5微米的颗粒。
Total suspended particulates include fine particulate matter called PM2.5 ― particles with diameters of no more than 2.5 micrometers.
总悬浮粒子包括被称为PM2.5的细颗粒物，即直径不超过2.5微米的颗粒。
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