Moreover, since the form of iron oxide used to make the droplets is magnetic, a magnetic field can be used to rotate them.
此外，由于制作这微粒的氧化铁是带有磁性的，就可以通过磁场来旋转其方向。
One way this might be done is to place a grid of wires behind them and induce a magnetic field where the wires cross. The spheres at the intersections would then rotate.
方法之一，有可能是在其背后建立一网格线和在线经过的地方引入磁场，在这地方的微珠就可以旋转了。
They act, in other words, like tiny bar magnets with north and south poles, making them rotate in a magnetic field.
打个比方，这个“磁极矩”可以让电子像一个微型的条形磁铁那样在磁场中旋转。
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