3 sentences

1. 警方正在回放监控录像。

   jǐng​fāng zhèng​zài huí​fàng jiān​kòng lù​xiàng.

   The police are replaying the surveillance footage.

   Source: Dong Chinese Dictionary

2. 你可以帮我回放一下刚才的那段视频吗？

   nǐ kě​yǐ bāng wǒ huí​fàng yī​xià gāng​cái de nà duàn shì​pín ma?

   Can you replay that video clip for me?

   Source: Dong Chinese Dictionary

3. 裁判通过回放录像，判定这个进球是有效的。

   cái​pàn tōng​guò huí​fàng lù​xiàng, pàn​dìng zhè​ge jìn​qiú shì yǒu​xiào de.

   After reviewing the video replay, the referee ruled that the goal was valid.

   Source: Dong Chinese Dictionary