n.救助者；节约器；储蓄者
Now the damper became a must, a life saver! 现在制音器变成必需设备,救助器!
A washing-machine is a saver of time and strength. 洗衣机是一种省时省力的机械。
n.救命者；水难救生员；救生工具
n.节省时间的事物
