没有长远的有意义的角色，因为任何结果都是可反转的。

There is no long-term significance to the characters, because any consequences are reversible.

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延长极性反转时间可降低极性反转时的场强。

Elongating the time of polarity reversal can reduce the field strength under polarity reversal.

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一直以来，溜溜球的绳子都是拴在轴上，让球盘旋转到底时可立即反转向上爬。

All along, the string was tied to the axle, causing the spinning disks to return up the cord immediately after they hit bottom.

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