题目内容
凸轮是具有凸出（ ）轮廓或凹槽的构件。
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只要正确设计出凸轮轮廓曲线，就可以使推杆实现任意预期的运动规律，而且结构简单、紧凑、设计方便，因此凸轮机构可以广泛地应用于各种机构传动来传递运动和动力。
It is reported that millions of people in the US are not covered by health ____ (insure).
The party really ____(come) to life once again when the huge birthday cake was served.
The train must be ____(run) late; we should have got to Beijing by now.
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