Objective:A mean concentration was shown by quantitative analysis of fetal cell-free DNA in maternal plasma.

提示母体血浆中游离的胎儿DNA 的定量分析在无创性产前诊断中有重要价值。

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It was showed that the mean concentration and accumulated amounts of runoff losses of nitrogen were highly correlated with N-application rates.

结果显示，随施氮量增加，农田径流液中氮素的平均浓度和氮素径流累积流失量提高，两者间呈显著正相关。

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Air quality is represented by annual mean concentration of fine particulate matter (PM10 and PM2.5, i.e. particles smaller than 10 or 2.5 microns).

空气质量用年平均细颗粒物的浓度表示(PM 10至PM 2.5，即粒径小于等于10或2.5微米的细颗粒)。

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Better nutrition should mean more concentration and better results.

ECONOMIST: A better education system calls for more than money

More spectrum concentration could mean even less customer choice and an increase in the cost of data plans.

FORBES: The Future Of Wireless: The Case For Spectrum Sharing

Arrhenius predicted that if the carbon dioxide concentration increased, the mean temperature of the surface of the earth would increase, in pretty much the way he said it would.

FORBES: NASA Data Pit Scientific Method Against Climate Astrology