On the high incidence families per grade relatives incidence rate obviously super-everyman.

高发家族中每级亲属发病率均明显高于普通人群，血缘关系越近下代发病率越高。

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A good rule of thumb is 10 minutes of homework per grade, said Barbara Kapinus, a senior policy analyst with the National Education Association.

芭芭拉·卡皮·努斯，全国教育协会的高级政策分析员，说不同年级间家庭作业的好的标准是相差10分钟。

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In grade 2, she easily beat the standard of 60 words per minute set by proponents of child literacy around the world.

在二年级，她可以轻松地达到全世界儿童读写能力提案人规定的每分钟60个单词的水平。

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One example is the Harlem Village Academy, which opened in September 2003 with one class of fifth graders and has been growing one grade per year since.

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In fact, Learn Bonds believes that junk bonds (non-investment grade but still rated) will provide returns that are at least 2% per year higher than investment grade bonds for at least the next few years.

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Tournament grade optical sensor 3600 Frames Per Second and supports stable movement speeds at 130 Inches Per Second.

ENGADGET: SteelSeries drops a bag of CES goodies: two headsets, three mice and one mobile controller