所述的方向开关分别是上按键、下按键、左按键、右按键。

The direction switch is provided with an up key, a down key, a left key and a right key.

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我们同样按照了一个化学开关，它可以允许电子交换过程以相反的方向进行。

We also installed a chemical switch that allowed the electron transfer process to proceed in the opposite direction.

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现在，科学家向跨越这项障碍的方向迈出了一步，创造出能想象到的最小的机械开关，仅包含两个原子。

Now, scientists may have taken one step toward surmounting that problem by creating the smallest conceivable mechanical switch—one involving just two atoms.

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