Graph Editor
参考：
Graph Editor | Blender Manual [Official]
F-Curve Modifiers
参考：
F-Curve Modifiers | Blender Manual [Official]
Randomize the Direction of Particle Rotation – Blender Artists Community
F-Curve Cyclic modifier: specify source frame range – Blender Artists Community
How may I create a continuously looping animation? – Blender Stack Exchange