Read Edit View history 一级头 yījítóu first stage Origin Definitions Defs Strokes Stroke Words Sentences Sents 一级头 一級頭 yījítóu first stage The first stage of a scuba diving regulator, which reduces high-pressure air from the tank to an intermediate pressure.
一级头 一級頭 yījítóu first stage The first stage of a scuba diving regulator, which reduces high-pressure air from the tank to an intermediate pressure.