如果值为—1，则翻转缩放对象，但不更改其垂直大小。
A value of -1 flips the scaled object but does not change its vertical size.
值- 1会翻转缩放的物件，但是不会变更它的水平大小。
A value of -1 flips the scaled object but does not change its horizontal size.
如果值介于 0和-1 之间，则翻转缩放对象并减小其宽度。
Values between 0 and -1 flip the scale object and decrease its width.
介于 0与-1 之间的值可对缩放的物件进行翻转并减少其高度。
Values between 0 and -1 flip the scale object and decrease its height.
负值可对缩放的物件进行垂直翻转。
负值可对缩放的物件进行垂直翻转。
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