n.保存人；保護者；救生用具

The police are the preservers of law and order. 警察負責維持治安。

The extremely arid desert climate is the best preserver of murals. 極端干燥的沙漠氣候是壁畫的最好保存者。

This is a life preserver. 這是救生用品。

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來救他。