HSK 7-9
公事
gōngshì名
work-related matters; documents
他处理公事从不带个人情绪。
Tā chǔ lǐ gōng shì cóng bú dài gè rén qíng xù.
He never brings personal emotions into official business.
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Appears across levels (7-9) in the HSK 3.0 word list.