Technicians must wear masks so that no dust particles contaminate the clean room.

技術人員必須戴口罩，以免任何灰塵微粒污染無塵室。

The air filters in our new office remove fine particles from the ventilation system.

我們新辦公室的空氣濾網能清除通風系統中的細微粒子。

Customers complained that the shipment contained small particles of plastic in the packaging.

顧客抱怨這批貨的包裝裡混有細小的塑膠碎屑。