In this case, we use the tween operator to construct the interpolated values for the scale between 1.0 and -1.0 to create the illusion of rotation.

在这个情况下，我们使用tween操作符来构建一个内插的数值，从1.0到- 1.0来创建一个旋转的现象。

youdao

Ajmal's action also involves an unusually high rate of abduction, or rotation around the elbow joint, which can create an illusion of the arm straightening.

WSJ: Cricket's 'Chucking' Challenge