Does that mean even today's minuscule exposure levels are too much?

难道这意味着今天的水平太多？

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Provide mechanical ventilation to maintain vapor concentrations below permissible exposure levels.

提供机械通风，将气体浓度控制在允许的逸出量以下。

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Praznik said the report ignores the science of risk assessment, which looks at both the hazard and exposure levels.

Darren Praznik说该报告忽略了危险检测科学会考虑危险水平和暴露程度。

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They say exposure at levels common among children in the United States may increase the chances that a child will be diagnosed with A.D.H.D.

VOA: special.2010.05.26

One is there's no lag period, notice that antibody levels start rising right away after the second exposure.

第一是没有迟滞期,请注意,抗体浓度迅速上升,在第二次接触抗原时

耶鲁公开课 - 生物医学工程探索课程节选

Cotinine levels in blood are often used to measure exposure to tobacco smoke.

VOA: special.2009.01.13

Exposure levels for animals in the study were similar to those found in U.S. cities.

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"When we compared them, we realised that the daily exposure levels are much higher than those PTTIs, " said Dr Tongesayi.

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Exposure levels for each setting are rated either Good, Caution or Insecure.

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