研究发现，只有55%的一二年级大学生在学术测试中取得显著进步。
It found that only 55 percent of freshmen and sophomores made statistically significant progress on an academic test.
这次闹事的学生多半是大学一二年级、二十岁以下的青年，他们没有社会实践经验。
Most of the students who were involved in the recent disturbances are freshmen or sophomores under the age of 20 who have little experience of society.
这次闹事的学生多半是大学一二年级、二十岁以下的青年，他们没有社会实践经验。
Most of the students who were involved in the recent disturbances are freshmen or sophomores under the age of 20 who have little experience of society.
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