中学语文语法教学中 ，一直保留着摘取“句子主干”的作法。
In the Chinese grammar teaching in middle schools, the method of abstracting sentence trunk has been kept.
现代数学在21世纪会变得更加重要，应该将现代数学基础定位为高师数学教育中的主干课程，这是时代的需要也是提高中学数学教学水平和教育质量的需要。
Modern mathematics would be more and more important during 21st century. We ought to consider the modern mathematics as the main course in the mathematics teaching of normal university.
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