Reading is a key to knowledge.
Meaning: This means that reading can help you learn and understand new things. It's like saying, Reading can help you unlock new knowledge.
Choice of Words: Key is a small object with teeth that is used to open a lock. Knowledge is information, understanding, or skills that you have learned. When you put them together, "Reading is a key to knowledge" means that reading can help you learn and understand new things.
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Related Expressions