如果小球再次滚落楼梯的话，其势能就能转化为功，类似于麦克斯韦在最初的头脑试验中使用冷热气体的运动做功一样。
This can be turned into work by letting it fall down the staircase once again—an analogy of using the movement of hot and cold gases to do work in Maxwell’s original thought experiment.
用鸟谷部博士的楼梯的比喻来看，小球就这样产生了一种单向上行的运动。
The ball was thus on a one-way trip up, to use Dr Toyabe’s analogy, the staircase.
15世纪，高尔夫开始出现在苏格兰，这项运动要求在一片宽阔的草地上，用球杆将一个白色的小球打进18个小洞。
Originating from Scotland in the 15th century, the game involves whacking a small white ball around a large field and trying to make it land in a series of eighteen tiny holes in the ground.
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