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呼吸保护设备
avia.	protective breathing equipment
environ.	respiratory protection apparatus Any of a group of devices that protect the respiratory system from exposure to airborne contaminants; usually a mask with a fitting to cover the nose and mouth (任何保护呼吸系统以避免空气传播的污染的设备；通常是能遮住鼻子和嘴的遮罩。)