All operation names start with "post," which means that the current transform object is multiplied from the right with the given transformation matrix — the order of matrix operations matters.
所有操作名都是以“ post ”开头的，表示当前Transform对象是从右边与给定转换矩阵相乘的——矩阵操作的顺序是非常重要的。
If any of the arguments are Infinity the transformation matrix must be marked as infinite instead of the method throwing an exception.
如果任意一个参数是无限大，变形矩阵也必须被标记为无限大，否则会抛出异常。
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.
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。
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