染
rǎn
to dye, to catch (a disease), to acquire (bad habits etc), to contaminate, to add color washes to a painting
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污染空气很不好。
wū rǎn kōng qì hěn bù hǎo。
Polluted air is bad.
政府要减少空气污染。
zhèng fǔ yào jiǎn shǎo kōng qì wū rǎn。
The government wants to reduce air pollution.