连他的消遣都是放下一个科目又拿起另一个科目的变换研究。
Even his recreation consisted in change of study, laying down one subject to take up another.
开设这门选修课的目的是希望学生在基本思想上对矩阵、变换等有一个初步了解，对将来进一步学习和工作有所帮助。
The purpose to offer this course is to make the students have the basic idea of matrix, transformation etc and also help them study and work well.
我们在研究教育目的时要注意思维方式的变换。
We should change our mode of thinking when we study educational aim.
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