an attendant employed at a beach or pool to protect swimmers from accidents
同义词：lifeguard
a life preserver in the form of a ring of buoyant material
同义词：life buoy, life belt, life ring
lifesaver详细解释
life.sav.er
n.（名词） One that saves a life. 救命者 See lifeguard 参见 lifeguard One that provides help in a crisis or emergency. 救生员：在危机中或紧急情况下提供援助的人 A life preserver shaped like a ring. 救生圈：圈状救生用具
