HSK 7-9
恶化
èhuà动
to worsen
连续污染使河流水质恶化。
Lián xù wū rǎn shǐ hé liú shuǐ zhì è huà.
Continued pollution worsened the river's water quality.
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Appears across levels (7-9) in the HSK 3.0 word list.