自记比重计,比重记录器

density recorder的用法和样例：

例句

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。
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。

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