buoyancy compensator
/ˈbʊlzˈaɪ/
n
English · buoyancy compensator中文 · 浮力补偿器Español · compensador de flotaciónFrançais · gilet de stabilisation
意味：Float device whose volume of air can be increased or decreased at will to stabilize the diver underwater; it can be used to return to the surface and to keep afloat without effort.