跑上山时的步子要保持不变，大约在45秒钟以上，然后再慢跑下山，这样重复跑四次以上。

Run up at a constant pace for up to 45 seconds, then jog back down and repeat four more times.

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因为计算机动画是真正3-D的，你可以重复用一场戏的动画或者某动画的一部分，不再说它是死板一成不变的运动了。

Since computer animation is truly 3-D, you can re-use the animation of a scene or parts of the animation and not tell that it is the exact same motion.

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想象一下，如果一切都保持不变，如果物体，人类和思想保持相互之间固定关系处于永久的无休止重复状态；

Imagine if everything stayed the same, if objects, people and ideas remained fixed in relation to each other in an unending state of permanence;

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