其次是弹性，是指地毯经过一定次数的动荷载碰撞后，厚度减少的百分率。

Second is elastic, it is to point to carpet after a certain number of dynamic load after the impact, reduce the percentage of thickness.

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结果：模型组的骨量明显减少，骨组织退化，出现骨小梁数目减少，厚度变薄，面积百分率下降；

Results:lumber number of bone significantly reduce, the bone organization degraded, the number of trabecular reduced, the thickness become thin, the area percent declined.

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主要研究结论如下：（1）1951-2008年，年和生长季的日照时数及日照百分率均呈减少趋势。

The main research achievements are as follows:There was a decreasing trend of the sunshine duration and sunshine percentage of year and growing season from 1951 to 2008.

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