二级减压器
/ˈɹɛɡjʊləɹ ˌɒktɐhˈiːdɹən/
n
English: regulator second stage · 二级减压器
English · regulator second stageEspañol · regulador de la 2ª etapa de descompresiónFrançais · détendeur second étage
释义：Apparatus that changes the pressure of the air coming from the regulator first stage to the pressure of the ambient air; the diver breathes this air in through a mouthpiece.