The nature of ginger and cinnamon, which become spicier with age; used to describe a person who becomes more upright, principled, and unyielding as they grow older.
他虽然年事已高，但姜桂之性不改，在关键问题上始终坚持自己的原则。
Although he is advanced in age, his ginger-cinnamon nature remains unchanged, always adhering to his principles on crucial issues.
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