A friend of mine this morning gave me a useful advice for my pocket camera.
He believes that the level of the air's humidity can affect the life of my pocket camera..
so...He gave me a package of...silica gel!
He said that I should put that in some air-vacuumed place with my camera. Initially, they were blue, but as time goes by they'll turn into violet. When that happens, We should Heaten it until it turns blue again.