In many countries of western Europe, the numbers of student in higher education doubled within five – year periods during the 1960s and doubled again in seven eight or 10 years by the middle of 1970s.
断句:
① In many countries of western Europe,
② the numbers of student in higher education doubled within five – year periods during the 1960s
③ and doubled again in seven eight or 10 years by the middle of 1970s.
各部分结构:
① 地点状语:In many countries of western Europe,
②主语( the numbers of student)+定语( in higher education)+谓语( doubled )+状语(within five – year periods during the 1960s)
③ and +并列谓语(doubled again )+状语(in seven, eight or 10 years by the middle of 1970s. )
参考译文:在西欧很多国家,二十世纪六十年代时,接受高等教育的学生数量五年内翻了一倍,至七十年代中期,该数量在七、八年或者十年间又翻了一倍。