retention of records recorder

例句：

1. 1. The recorder was playinga beautiful piece of music.
   录音机正在播放一首美妙的音乐。
2. 2. The recorder isused to play records.
   录音机用于播放唱片。
3. 3. The recorder was used to documentthe event.
   录音机被用来记录这个事件。