What is the difference between a peak area comparison and a quantitative limit for related substances?

相关物质峰面积比较和定量限度有什么区别？

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It is the basic way that goes from case study to area study, and to area comparison in the studies of basis of the rural policy.

由个案调查，到区域研究，再到区域比较，是农村政策研究的基本进路。

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For comparison, the bottom image shows the same area on March 17, 2007.

下图是2007年3月17日的图像，大家可以对比一下。

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So since this area is actually where the comparison to Facebook is valid, how can Google both increase the proportion of active users as well as boost engagement on the Stream?

CNN: Google+ creator: Don't call it a social network

In comparison, the total floor area of an Airbus CJ is 905 square feet.

CNN: Luxury living at 35,000 ft

They are modest in comparison with the 56, 000 jobs the area lost in the first two years of the downturn.

WSJ: Long Island Is an Unlikely Jobs Engine