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What does it mean that a cat has nine lives and only one heart?

Cats are loyal to their owners, independent and self-protective.

"Cats have nine lives" in this sentence means that cats are so tenacious that they can escape or save themselves even if they are injured or in danger. Only One Heart emphasizes the cat's loyalty and love to its owner. Cats will treat their owners wholeheartedly and provide services and protection for their owners.