但是，事实上大学生必须要学习一些必修课程，以及其他选修课程。
But, in actuality, college students have to take some compulsorycourses and some required selective courses.
大学写作是高校中文专业的一门基础课，也是其他专业的一门选修课。
College writing is a basic course for Chinese majors as well as a selective one for non-Chinese majors in higher schools.
因此，等级分层教学不但适用于高校排球选修课的教学，而且也能够为其他球类项目的教学改革提供一定的参考价值。
Therefore, stratification of teaching is applicable not only in volleyball course but also in providing a reference value in reforming of other ball games teaching courses.
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