The study shows that the magnetic pull force can decrease both the first critical speed and the critical amplitude.
研究表明，磁拉力可降低一阶临界转速和临界振幅；
A force is exerted on the magnetic bead using a magnetic field, enabling researchers to pull and rotate a single DNA molecule in a controlled fashion.
研究者运用磁场使磁珠产生力，这样就在可控模式下可以对单个DNA分子进行拉伸旋转。
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