The long-termed development of the German school system in the 19th and 20th ...
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Long term time series on education were collected in order to demonstrate quantitatively the different periods of the development of the German educational system from 1775 and...
为定量展示1775年起德国教育体系发展的不同阶段，研究人员收集了长期教育时间序列（time series）数据……
