HSK 7-9
炼
liàn动
to refine; to smelt
矿石需在高温下炼成金属。
Kuàngshí xū zài gāowēn xià liàn chéng jīnshǔ.
Ore must be refined into metal at high temperature.
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Appears across levels (7-9) in the HSK 3.0 word list.