名词
中文翻译：密度指示器
同义词：
['mass density indicator', 'mass fraction indicator']
例句：
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1. The density indicator on the scale shows that the sample is close to the melting point.
秤上的密度指示器显示样品接近熔点。
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2. The density indicator in the lab indicates that the solution is not as concentrated as expected.
实验室中的密度指示器表明溶液没有预期的那么浓。
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3.The density indicator on the road sign indicates the speed limit for the area.
路标上的密度指示器标明了该地区的速度限制。