aqualung
/ˈækwəlʌŋ/noun
- a portable breathing apparatus for divers, consisting of cylinders of compressed air strapped on the diver's back, feeding air automatically through a mask or mouthpiece水肺（指潜水员使用的呼吸装置, 包括潜水员背部的压缩空气圆筒及面罩）。
词源
1950s (originally a proprietary name in the US)： from Latin aqua 'water' + LUNG.