HSK 7-9
精练
jīngliàn形
(textiles) to scour; to degum (silk); variant of 精炼
工厂先把生丝精练再染色。
Gōng chǎng xiān bǎ shēng sī jīng liàn zài rǎn sè.
The factory scours the raw silk before dyeing it.
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Appears across levels (7-9) in the HSK 3.0 word list.