On the Understanding of Words in Fossil Sound and Seeing the Weather from Clouds

"Information" is the knowledge passed to us by fossils in the past, which is a metaphor and rhetoric to modify the role of fossils in sentences.

The password is that as long as the fossil is found and cracked, the secret of history will be solved.

The "signboard" means that the cloud represents the weather and is closely related to the weather. Clouds are closely related to the weather, which means the center.