在关键帧骨骼动画中，中间帧的生成效果直接影响着动画的自然流畅程度。
In the skeletal animation, effect of in-between frames will influence the fluency of animation directly.
关键帧动画是3维动画制作的常用模式，中间帧插值又是关键帧动画中最为繁琐的环节。
Key-frame animation is the common mode for making 3D animation, and tween-frame interpolation is the most important part.
最残酷的事情在于中间帧动画人几乎不可能得到为自己喜欢的片子画中间帧的机会，他们会很快被分配的工作累垮。
The cruelest part of being an inbetweener is that they rarely get to work on anything they are fans of and what they do get to work on they burn out on quickly.
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