这样不但对磁系表面磁场影响小，而且对磁系有足够强的包裹涨紧力，效果显著。
Such not only of magnetic field is the surface of magnetic effect is small, and are strong enough package when tight force, the effect is remarkable.
这样不但对磁系表面磁场影响小，而且对磁系有足够强的包裹涨紧力，效果显著。
Such not only of magnetic field is the surface of magnetic effect is small, and are strong enough package when tight force, the effect is remarkable.
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