只要永磁环和永磁体sn的磁力线永久存在，旋转也将始终存在。
The rotation will last for ever if the permanent magnetic ring and the magnetic force line of the permanent magnet SN exist for ever.
只要永磁环和永磁体sn的磁力线永久存在，旋转也将始终存在。
The rotation will last for ever if the permanent magnetic ring and the magnetic force line of the permanent magnet SN exist for ever.
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