Methods: The controlled human exposure experiment was applied in this study.

方法：采用控制暴露人体实验。

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The re exposure experiment also shows that the effect of the aluminum flocculant on the activated sludge in non acute.

二次暴露实验的结果还表明，铝絮凝剂对活性污泥的影响是非急性的。

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In addition, two methods of verifying exposure data are rendered, and the problems which we should pay attention to during exposure experiment are also presented.

此外，提出了两种曝光数据检验的方法，并对曝光实验中应注意的问题作了说明。

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The cosmonauts were unable to collect a material exposure experiment from the station exterior due to a stuck hinge that prevented it from folding closed, NASA officials said.

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