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