名词
中文翻译：密度记录器
同义词：
['density meter', 'density gauge', 'density indicator']
例句：
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1. The density recorder was used to measure the density of the water.
密度记录器被用来测量水的密度。
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2.The density recorder showed that the sample had a high density.
密度记录器显示样本的密度很高。
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3. The density recorder was used to monitor the progress of the project.
密度记录器用于监控项目的进展。