人类可以很容易地定位房间里的其他物体，而机器人几乎不可能完成这项任务。

Humans orient themselves with other objects in a room very easily, Robots find the task almost impossible.

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然而因为时空本身是在能层里移动，物体保持在固定位置是不可能的。

However, because space-time itself is moving in the ergosphere, it is impossible for objects to remain in a fixed position.

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除非不可能，我们一生的满足均取决于我们把困难定位到怎样的高度。

Short of the impossible, the satisfactions we get from a lifetime depend on how high we place our difficulties.

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