求翻译：Figure 13 presents the three components Mx , My , and Mz of the total torque Motot applied on the outer part. It is observed that (with and without friction) the direction of Motot is not stationary in space as presented earlier in Fig. 11, but oscillates in space at a sixfold frequency. This can be explained by the fact that contact points do not stay in the bisecting plane. The R6 behaviour is due to the six balls.是什么意思？

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