As a result, their math grades overtook those of the other students by the end of the first semester—and the gap between the two groups continued to widen during the two years we followed them.

结果，他们的数学成绩在第一个学期末就超过了其他学生——在我们持续观察他们的两年中，两组学生之间的差距继续扩大。

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Even in the United States, many people still associate the educational "gender gap" with girls left behind in math.

即使在美国，很多人仍然把教育的“性别差异”与女孩儿在数学上的落后表现联系起来。

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For the past five years, the national conversation on education has focused on reading scores, math tests and closing the "achievement gap" between social classes.

过去的5年中，全国范围内关于教育的讨论集中在阅读分数，数学考试，消除社会各阶层之际成就差距上。

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Concerned about the math and science gap?

FORBES: Does the Wage Gap Start in Kindergarten?

But by 2012, city children in third and fourth-grades had narrowed the test-score gap on math with their peers throughout the state but fell a few points short of pulling even.

WSJ: Reputation on the Line

We launched a national competition to improve our schools by investing only in reform that closes the achievement gap, and inspires students to excel in math and science, and turns around failing schools that steal the future from too many young Americans.

WHITEHOUSE: Strengthening America��s Historically Black Colleges and Universities | The White House