Then apply the transformation matrix to what you get by multiplying it on the left.

然后把变换矩阵应用到左边乘以它得到的东西上。

Well, as you apply some sort of matrix transformation, the areas of these parallelograms, well, they don't stay the same.

当你进行某种矩阵变换时 这些平行四边形的面积 它们不会保持不变。