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4 New HSK word(s): 4 污染 → + pollution/ contamination/ CL:個|个[ge4] 5 传染 → + to infect/ contagious 6 感染 → + infection/ to infect/ to influence 6 染 → + to dye/ to catch (a disease)/ to acquire (bad habits etc)/ to contaminate/ to add colour washes to a painting