If that weren't the case do you think there would be any roller coasters, bungee jumpers or poisonous blowfish eaters?
要不是这样，还会有过山车吗，蹦极吗？还会有人冒着中毒的风险吃河豚鱼吗？
Discusses mechanism CAD design based on case analysis and shows an electric roller design example.
采用基于实例的分析方法进行机械CAD设计，并举出一电动滚筒设计的例子。
The case of a plate CAM with an oscillating roller follower is taken as an example. This method is also applicable to other types of plate CAM system.
文中以滚子摆动从动件平面凸轮为例，其解题方法也适用于其它类型平面凸轮机构。
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