density recorder

• 自记比重计,比重记录器

density recorder的用法和样例：

例句

1. Use Recorder to record keystrokes or mouse actions to play back later.
   用记录器记录击键或鼠标行为，以备后来播放。
2. According to the record, the cord was the oldest recorder the people could afford.
   据记载，绳子是人们用得起的最古老的记录器。