Environmental investigations have found very high concentrations of lead both outside and inside peoples' homes.

通过环境调查发现，人们的家里家外都具有很高的铅浓度。

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The investigators set the environmental conditions: these include the oxygen and nutrient concentrations and the landscape of connective tissue that surrounds the cells.

调查人员设定了环境条件：包括氧和营养浓度，以及包绕细胞的结缔组织构造。

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Cement grinding process production, environmental air contains high concentrations of dust.

水泥厂生产粉磨加工过程多，环境空气中含粉尘浓度高。

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DiNapoli said he is withdrawing his resolution, which was filed in response to a U.S. Environmental Protection Agency progress report last summer that said PCB concentrations were higher than expected in some areas outside the project's footprint.

WSJ: GE to study Hudson River cleanup expansion

Much of the talk at this week's conference was how major urban centers could work toward adhering to the Kyoto Protocol, the existing environmental treaty that sets targets for nations to reduce greenhouse gas concentrations.

CNN: Bill Clinton to cities: Act on climate