self-recorder

例句：

1. 1. This self-recorder is perfect for recording lectures.
   这个录音机非常适合录制讲座。
2. 2. The teacher asked the students to self-record their homework.
   老师要求学生们自己录下他们的家庭作业。
3. 3.The self-recorder has a long battery life, which makes it convenient for us to use in different places.
   这种录音机电池寿命长，这使得我们可以在不同的地点使用它。