To remain unstained or maintain one's integrity and principles despite being in unfavorable or difficult circumstances, much like a plant growing in mud without being tainted by it.
尽管他身处逆境，工作屡屡受挫，但他始终泥蟠不滓，坚守着自己的职业道德和人生准则。
Although he faced repeated setbacks in his work and was in adverse circumstances, he always remained unstained by the surrounding difficulties, firmly upholding his professional ethics and life principles.
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