HSK 7-9
改良
gǎiliáng动
to improve (sth); to reform (a system)
农民改良土壤后提高产量。
Nóng mín gǎi liáng tǔ rǎng hòu tí gāo chǎn liàng.
The farmers increased yields after improving the soil.
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Appears across levels (7-9) in the HSK 3.0 word list.