转眼：双手托腮，让眼球按上、下、左、右的顺序转动10次，接着再逆时针、顺时针各转动10次。
Turn: her hands cupping gills, let eye according to the top, bottom, left and right order rotation 10 times, then counterclockwise, clockwise every rotating 10 times.
借助于四元数理论证明了任意顺序下刚体有限转动合成的可交换性定理。
With the help of the theory of quaternions the theorems of commutativity of composition for the finite rotation of rigid body are proved in the any order.
装配完成后，用手转动泵轴，没有擦碰现象，转动比较轻滑均匀即可，拆卸可按上述装配顺序相反的进行。
After assembly, move the pump shaft with hand, it should be smooth and uniform without touch. Disassembly can be made with the steps contrary to above ones.
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