pollution-free

常見(jiàn)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(hù)口罩衹能在無(wú)汙染的環(huán)境中，包括無(wú)確診或疑似流感病人的環(huán)境中摘除。
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