HSK 7-9
腐烂
fǔlàn动形
to rot; to putrefy; (fig.) corrupt
潮湿使木板逐渐腐烂。
Cháo shī shǐ mù bǎn zhú jiàn fǔ làn.
Dampness gradually caused the boards to rot.
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Appears across levels (7-9) in the HSK 3.0 word list.