preserver

n.

保护者，保存者；

复数：preservers

life preserver（美）救生用具；（英）护身棒

1. The police are the preservers of law and order.
   警察负责维持治安。
2. 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。
3. This is a life preserver.
   这是救生用品。
4. 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。

Linear Preserver Problems
Linear Preserver Problems
On determinant preserver problems
A survey of linear preserver problems
Some linear preserver problems on upper triangular matrices
Linear preserver problems: A brief introduction and some special techniques
Some general techniques on linear preserver problems
The Proverb: A Preserver of Shona Traditional Religion and Ethical Code
Biodiversite et gestion forestiere. Connaitre pour preserver: synthese bibliographique
Overgroups of some classical linear groups with applications to linear preserver problems