1、The harmfulness and source of the particulate matter in indoor air are introduced.
作者介紹室內(nèi)空氣中顆粒物的危害與來源。

2、Particulate matter includes particles from molecular size to greater than 10mm in diameter.
微粒物質(zhì)包括從分子大小到直徑大于10微米的粒子。

3、The particulate matter so suspended.
處于這種懸浮狀態(tài)的膠質(zhì)