Where the naught refers now to the standard concentration.

作比较,零表示标准浓度。

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The intensity or concentration of the occupational-disease-inductive substances does not meet the national standard of occupational health;

工作场所职业病危害因素的强度或者浓度超过国家职业卫生标准的；

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The average concentration of particulates in city air during 2008, for example, was six times the ideal standard recommended by the World Health Organization.

以2008年全年的数据为例，北京市市区空气单位体积微小聚合颗粒数是世界卫生组织标准的6倍。

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Before beginning the study, participants were given standard cognitive tests, many involving executive-function tasks such as concentration and shifting from one mental task to another.

WSJ: When Computer Games May Keep the Brain Nimble