【原文】新建一个画框，调整角度：-180°，软件会自动变成180°，把负值变成了正值，这会影响动画的旋转方向。目前的解决办法是把调整角度：-179.999°才能实现-180°。
【translation】Create a new frame and adjust the Angle: -180°. The software will automatically change this to 180° and change the negative value to a positive value. This will affect the rotation direction of the animation.The current solution is to adjust the Angle: -179.999° to achieve -180°.