1、 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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