的确，四元数支持球形线性插值(SLERP)，那意味着点沿着球体表面传播就像他们从一个方位移到另外一个一样。

Indeed, quaternions support spherical linear interpolation (abbreviated as SLERP), which means that points travel along the surface of a sphere as they are moved from one orientation to the next.

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换句话说，在数学上描述方位就等价于描述角位移。

In other words, describing an orientation is mathematically equivalent to describing an angular displacement.

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嘱受检者两眼随手指移动，头部不动。按八个方位移动手指。

Ask client to follow movement of finger with eyes, keeping head still. Move finger slowly through each of eight cardinal gazes.

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