In his first six months in the White House, President Barack Obama has seen his approval ratings slip about 10 percentage points as he takes on a battered U.S. economy.

自从奥巴马入主白宫，接手了糟糕的美国经济，时间已经过去了六个月，而他的支持率下降了约10%。

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Three different microstrain stages were found after analysis of the relations between the stress and the percentage of yielding grain and the average number of slip band per yielding grain.

分析了应力与已滑移变形的晶粒百分比，以及与已滑移变形晶粒中平均滑移带数目之间的关系，发现微应变可分为三个不同的阶段。

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CONCLUSION. : Disc height and slip percentage had the largest effect on intervertebral foramen area and volume in this model of low-grade, low-dysplasia isthmic spondylolisthesis.

结论：在峡部腰椎滑动发育异常的模型中椎间盘高度和滑动比例能显著影响椎间盘面积和容积。

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