The contents below are taken from the book Extra Reading for Middle Schools.
以下内容摘自《中学课外阅读》一书。
The plane geometry is one of middle school mathematics basic contents.
平面几何是中学数学的基本内容之一。
Rapidly available potassium contents in 77.3 % production units were middle.
速效钾含量处于中下水平的生产单位占77.3%；
Environment education is one of the most important basic educational contents in middle school.
环境教育是中学基础教育的重要内容之一。
Environment education is one of the most important basic educational contents in middle school.
环境教育是中学基础教育的重要内容之一。
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