Lower reading achievement scores and grades in fifth grade contributed to reduced grades in middle school and thereby contributed to a 40% lower high school graduation rate.

五年级学生的阅读成绩分数较低，导致其进入中学后成绩下降，进而导致高中毕业率下降40%。

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But if winds continue to pick up at the same rate, hurricanes could become far more damaging by the middle of the century.

但是假如风持续的以一个相同的速率增长的话，那么在本世纪中叶，飓风将变得更具破坏力。

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Still, many experts say we don't need to raise the tax rate on the middle class; we just need to get rid of some of those despised loopholes (or beloved incentives).

尽管如此，许多专家表示我们不需要提高中产阶层的税率；我们只是要消除一些被忽视的税务漏洞(或者叫被深爱着的税务激励)。

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Experts say job losses might slow later this year, but the unemployment rate could rise until the middle of next year.

VOA: special.2009.05.29

They just elongated each measure by its same amount so we had harmony changing on each measure, and then in that middle section each chord was changing at the rate of two measures.

但它的基本形式没有改变，而在每个小节中和声都发生了改变，接着在中间的乐节，每个和弦每两小节改变一次。

耶鲁公开课 - 聆听音乐课程节选

The city's middle-class unemployment rate is 6.2%, three times higher than it was in 2008, the report said.

WSJ: Quinn Address Aims at Middle Class

The trouble for them is that, among the middle classes at any rate, the racial gulf is closing.

ECONOMIST: Blurring black and white

The principle is that affluent Americans should pay the same -- at least the same tax rate as middle American wage earners.

WHITEHOUSE: Press Briefing