A man's knees are worth gold, meaning a man of integrity should not easily humble himself or yield to others.
面对困境，他始终坚守原则，因为他深知男儿两膝有黄金，绝不能轻易低头。
Facing adversity, he always adhered to his principles, because he deeply understood that a man's knees are worth gold and he could never easily bow his head.
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