One way this might be done is to place a grid of wires behind them and induce a magnetic field where the wires cross.

有一种也许可行的方法，就是在其后放置一线网，在叉线处引入磁场。

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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。

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If you cross another country's wires along the way, you have to pay them, too.

如果在这之间要使用到其它国家的线路，你也得给他们付费。

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Dean McCarron, an industry analyst at Mercury Research, points out that this is already happening to some extent, since wires can cross over one another on a chip, though no actual transistors are stacked on top of each other.

ECONOMIST: REPORTS