The analysis uses two waves of data from the "National Longitudinal Study of Adolescent Health" and the "Adolescent Health Academic Achievement Study."

分析者从两组数据进行研究"纵向的研究全国范围内的青少年健康”和“青少年健康学术研究”

youdao

On the one hand, it is because of your encouragement and continuous assistance that now I have obtained a splendid academic achievement in my study career, and serve as chairman of Student Union.

一方面，正是由于您的鼓励和不断的帮助，现在我才在学习生涯中取得了优异的成绩，并担任了学生会主席。

youdao

The finding "is a significant achievement, both technically and scientifically, " said astronomer Hans Zinnecker of the University of Stuttgart, who was not involved in the study.

这一发现”是一次有重大意义的成就，在技术上和科学上都是“斯图加特大学的天文学家Hans Zinnecker说，他没有涉及这次研究。

youdao

Incoming Hostos President Matos Rodriguez, whose parents were born in Puerto Rico, said that for every one of the students, the completion of their two years of study leading to their associate degree is a proud achievement.

VOA: standard.2010.06.05

Study after study shows the achievement gap starts off very young.

WHITEHOUSE: The White House

The Democrats and the teachers want to wait another year, when a study of appropriate standards for student achievement in the state is expected to be ready.

ECONOMIST: Mine! No, mine!

It total, 80% of teachers surveyed said they believed poverty had a negative impact on pupils' attainment - with problems including under-achievement, not having a quiet place to study at home, inability to concentrate and lack of access to computers and the internet.

BBC: Poverty hitting pupils' learning, survey suggests