HSK 7-9
当事人
dāngshìrén名
persons involved or implicated; party (to an affair)
警方正在询问事故当事人。
Jǐng fāng zhèng zài xún wèn shì gù dāng shì rén.
The police are questioning the parties involved in the accident.
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Appears across levels (7-9) in the HSK 3.0 word list.