To remain unblemished and uncorrupted despite adverse circumstances or a morally compromising environment; possessing an unyielding spirit and firm integrity.
尽管周围环境复杂多变，他始终保持着积极向上的心态，真是磨不磷，涅不缁
Despite the complex and ever-changing environment, he always maintained a positive and upward-looking attitude, truly demonstrating an unyielding spirit.
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