一个先前的关于心理失常和受教育程度的研究的确证明了酒精滥用在大学生辍学上所扮演的重要角色。
A previous study of mental disorders and educational attainment did find a significant role for alcohol abuse in limiting college careers.
结论在改进小学生营养知识-态度-行为的过程中，学校扮演了一个比家长更为重要的角色。
Conclusion Primary schools play a more important role than pupils' parents for improving pupils' knowledge, attitude and practice with nutrition.
角色表演。一个学生扮演大厅柜台服务员，其他学生扮演游客。游客向你询问有关你们城市的一些情况。
Role play. One student in an information booth worker, and the other students are tourists. The tourists ask questions about your city.
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