emergency regulator
/ɪmˈɜːdʒənsi ˈɹɛɡjʊlˌeɪtə/
n
English · emergency regulator中文 · 备用呼吸调节器Español · regulador de emergenciaFrançais · détendeur de secours
意味：Regulator second stage that is connected by a hose to the regulator first stage; it is used to supply air to a diver in difficulty.