2.1 用水需求模型选择 本研究采用Deanton and Muellbauer 所提出的近乎完美的需求体系（Almost Ideal Demand System，AIDS） [4] 来分析居民用水的需求弹性以及其它因素的影响。
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在调查的基础上我建立了大学生的需求体系，调查总结了现今大学生的真实需求。
Some investigations on the basis of which I have established the requirement system summarize the real requirements of nowadays college students.
这些需求导致了高等教育体系的迅速扩张，它始于20世纪60年代，迅速发展于70年代和80年代（尽管并不均衡）。
These demands resulted in a very rapid expansion of the systems of higher education, beginning in the 1960s and developing very rapidly (though unevenly) during the 1970s and 1980s.
老师们也不断报告自己能力欠缺，无法满足小学生们的精神健康需求，并且经常提到缺乏来自英国国家医疗服务体系的训练、专业知识培训以及支持。
Teachers also consistently report how ill-equipped they feel to meet pupils' mental health needs, and often cite a lack of training, expertise and support from the National Health Service.
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