颗粒物的英文：
particulate matter

particulate contaminant
粒状污染物

Do you know the function of the particulate?
你知道这种颗粒的特性吗？

The company has pledged to control particulate emissions.
该公司已经承诺控制粒子排放物。

A special group was organized to dig up the particulate of the case.
成立了一个专门小组来查明该案件的各个细节。

Pulverized particulate matter ejected by volcanic eruption.
火山灰火山爆发喷射出来的粉末状颗粒物质

be of importance;matter
有重要性;有关系

It is no laughing matter.
这没有什么可笑的。

deposited matter
沉积物|沉淀物

It makes no matter.
那无关紧要。

This is a matter of no account.
这是一件无关紧要的事。