n.保存人；保护者；救生用具
The police are the preservers of law and order. 警察负责维持治安。
The extremely arid desert climate is the best preserver of murals. 极端干燥的沙漠气候是壁画的最好保存者。
This is a life preserver. 这是救生用品。
The life preserver kept him up until the boat came. 救生衣使他保持浮在水面直到小船来救他。
