HSK 7-9
回合
huíhé名
one of a sequence of contests (or subdivisions of a contest) between the same two opponents; round (boxing etc); rally (tennis etc); frame (billiards etc)
拳手在第三回合击倒对手。
Quán shǒu zài dì sān huí hé jī dǎo duì shǒu.
The boxer knocked down the opponent in the third round.
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Appears across levels (7-9) in the HSK 3.0 word list.