名词
中文翻译：质量分数
同义词：
['density fraction', 'mass fraction', 'density fraction']
例句：
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1.The oil is composed of a mixture of different types of fats and oils.
这种油是由不同种类的脂肪和油混合而成的。
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2. The scientist used the mass fraction to determine the composition of the sample.
科学家使用质量分数来确定样本的成分。
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3.The engineer calculated the mass fraction of water in the soil to ensure it was within safe limits.
工程师计算了土壤中水分的质量分数，以确保其处于安全范围内。