You pretty much know all the important stuff about quaternions now.
你现在几乎获得了所有关于四元数的重要信息。
Except for one thing: you don't have a good reason to use quaternions yet.
但除了一件事情，你还没有明白为何要使用四元数的原因。
Quaternions are used to describe the attitude of the rigid body system in this paper.
采用四元数法描述了刚体姿态系统。
Quaternions are used to describe the attitude of the rigid body system in this paper.
采用四元数法描述了刚体姿态系统。
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