It is found that the mean mass concentrations varied from month to month due to changes in emission intensity and meteorological conditions.

随着排放强度和气象条件的改变，痕量金属的月平均质量浓度也发生相应变化。

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The experimental results demonstrate that mass concentrations calculated by the model are in good agreement with those measured by a norm-referenced instrument.

实验结果表明，该模型计算的质量浓度值与标准参照仪器的测量值吻合较好。

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Patients with high serum E2 mass concentrations on the day of hCG administration treated with all-embryo cryopreservation may result in favorable pregnancy outcomes.

对E2高水平的患者采用全胚胎冻存的方法能够获得满意的妊娠结局。

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In addition, the theory of homeopathy actually defies conventional scientific understanding--in particular, the law of mass action, which demands that the rates of chemical reactions be proportional to the concentrations of substances involved.

FORBES: Homeopathic Medicine Is Homeo-Pathetic