pollution-free的用法和樣例：
例句
- Respirators should only be removed when the wearer is in an area that is considered free of airborne hazards, including confirmed or suspected influenza patients.
呼吸防護口罩只能在無污染的環境中，包括無確診或疑似流感病人的環境中摘除。
辭彙搭配
- pollution-free fuel 無污染燃料
- pollution free technology 無污染工藝
- pollution-free energy 無污染能源
- pollution-free engine 無污染髮動機...
