Libraries guard secrets of the past.

Meaning: This means libraries are repositories of knowledge and information from the past that can be accessed and learned from.

Choice of Words: Libraries are places where books and other materials are kept for people to read or borrow. Guard means to protect or keep something safe. Secrets are information that is kept hidden or private. Past is the time that has already happened. This sentence is a metaphor, comparing libraries to guardians of knowledge and history.

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