Definition
To play back refers to the process of using a machine to listen to or view previously recorded audio or video.
播放（录音或录像）
After the meeting ended, she played back the recording to ensure she wouldn't miss any key points.
会议结束后，她回放录音以确保没有遗漏任何重点。
They planned to play back the footage of the game to analyze the opponent's strategies.
他们计划回放比赛的录像来分析对手的策略。
If you're unsure about what you heard, you can play back the recording at any time.
如果你不确定听到了什么，可以随时回放录音。