Second, making "five-year system" impermanent connect mode from middle to high vocational school.

第二，将“五年一贯制”作为中高职衔接的过渡模式；

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This school year, the schools shifted from hard cover to electronic textbooks for social studies in its middle and high schools.

本学年，这些学校的初中和高中的社会研究教材从纸质教材转向了电子教材。

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The move from elementary school to middle school or junior high can be difficult.

从小学进入中学或者初中的这种变动可能会有困难。

《柯林斯英汉双解大词典》

From there, after high school, I went to New York University. I completed bachelors of Middle-eastern and Islamic studies and political science.

在读完高中以后，我去了纽约大学，拿到了,中东和伊斯兰研究以及,政治学的学士学位。

普林斯顿公开课 - 人性课程节选

According to the World Bank, only 13 countries have moved from upper middle to high income since 1960.

FORBES: Emerging Nations Realizing It's Not Easy Getting Rich

Dr Seeley says that truancy often begins after students' transition from middle school to high school in the US, at 13 or 14 years old.

BBC: NEWS | UK | Education | Truancy: How do countries compare?

Rising in three generations from artisan to high middle class, the Bells were beginning to marry into the aristocracy.

NPR: Excerpt: 'Gertrude Bell'