Combining with the achievement of study on human-body joint of biologic medical science, a kind of four-bar link close-chained bionic joint was studied.

结合生物医学人体关节研究成果，研究了一种四连杆封闭链仿生关节；给出了一种由四连杆机构组成、智能MR阻尼器控制的多轴仿生膝关节机构；

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The ratio of serious problems was 8. 8%. The results showed that poor achievement of study, single hobby, losing love and having few friends were associated with low levels of mental health.

大学生中学习成绩差、对所学专业兴趣低、有失恋史、业余爱好单一、知心朋友少的学生其心理健康水平较低。

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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。

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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

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!

But they also say the study shows a "wide range of achievement, with a large difference between the scores of the highest and lowest achievers".

BBC: RELATED BBC SITES

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