Read Edit View history 二级头呼吸器 èrjítóuhūxīqì regulator; demand valve Origin Definitions Defs Strokes Stroke Words Sentences Sents 二级头呼吸器 二級頭呼吸器 èrjítóuhūxīqì regulator; demand valve (scuba diving) second-stage regulator; a device that reduces air pressure to a breathable level upon inhalation
二级头呼吸器 二級頭呼吸器 èrjítóuhūxīqì regulator; demand valve (scuba diving) second-stage regulator; a device that reduces air pressure to a breathable level upon inhalation