If you have a space curve then you will have a third component here.
如果是空间曲线的话，这就应该多出第三个分量。
The motions of plane and space curve have a wide range of applications.
平面和空间曲线的运动有着广泛的应用。
C So, let's say that I have a curve, c, in space.
假设有一条在空间中的曲线。
C So, let's say that I have a curve, c, in space.
假设有一条在空间中的曲线。
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