让这个鼠标与众不同的一点是它使用了一个钢球，而不是之后出现的现代鼠标里的橡胶球。
Unique to this mouse was the use of a steel ball, instead of the usual rubber found in subsequent and modern mice.
一小块橡胶售价29美元，真够贵的——这是苹果公司的一个小小的利润点。
For a little piece of rubber, at $29, they are amusingly expensive -- a great little profit center for Apple.
非常酷的一点：轮胎由结实的橡胶环刻而成(当时的轮胎都不充气的)，这是唯一能支撑车重的方法。
One cool bit: the tires were chiseled from solid blocks of rubber, the only way to support the weight of the car.
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