4 sentences

1. 拳击手在第一回合就被击倒了。

   quán​jī​shǒu zài dì​yī huí​hé jiù bèi jī​dǎo le.

   The boxer was knocked down in the first round.

   Source: Dong Chinese Dictionary

2. 拳击手在第一回合就击倒了对手。

   quán​jī​shǒu zài dì​yī huí​hé jiù jī​dǎo le duì​shǒu.

   The boxer knocked out his opponent in the first round.

   Source: Dong Chinese Dictionary

3. 这位拳击手在最后两个回合中反败为胜。

   zhè wèi quán​jī​shǒu zài zuì​hòu liǎng gè huí​hé zhōng fǎn​bài​wéi​shèng.

   The boxer turned the tide and won in the last two rounds.

   Source: Dong Chinese Dictionary

4. 经过几个回合的艰苦谈判，双方终于达成了协议。

   jīng​guò jǐ gè huí​hé de jiān​kǔ tán​pàn, shuāng​fāng zhōng​yú dá​chéng le xié​yì.

   After several rounds of tough negotiations, the two sides finally reached an agreement.

   Source: Dong Chinese Dictionary