Environmental Protection Agency studies indicate that indoor levels of pollutants may be 2 ~ 5 times, and occasionally more than 100 times, higher than outdoor levels.
环境保护机构的研究表明，较之室外空气污染，室内空气污染程度或许要高出2 ~ 5倍，有时甚至100多倍。
In Slate's Fray, Repace says I'm wrong about outdoor smoke: Mr. Saletan states in part: "Studies have proved that secondhand smoke is harmful.
Repace说自己对于户外吸烟认识错误：Saletan先生在某种程度声明：“研究已经表明，二手烟是有害的。
For the average person running at 5 to 9 MPH, some research shows that outdoor running burns up to 5 percent more calories, while other studies show no difference.
对一般人来说速度在5到9mph之间，一些研究表明室外跑可以多消耗5%的卡路里，然而另外一些研究却认为没有什么差别。
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