HSK 7-9
功臣
gōngchén名
meritorious official; person who renders exceptional service; hero; (fig.) sth that plays a vital role
老机器是工厂增产的功臣。
Lǎo jī qì shì gōng chǎng zēng chǎn de gōng chén.
The old machine played a vital role in increasing the factory's output.
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Appears across levels (7-9) in the HSK 3.0 word list.