HSK 5
化
huà后缀（动）
to make into; to change into; -ization; to ... -ize; to transform; variant of 花; abbr. for 化学
冰在太阳下慢慢化了。
Bīng zài tài yáng xià màn màn huà le.
The ice slowly melted in the sun.
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Appears across levels (5（6）) in the HSK 3.0 word list.