单词：drum cam
drum cam的用法和样例：
例句
- The camshaft has a cam, on which there is a lob, or bump.凸轮轴上有一个凸轮，凸轮上有一个凸角。
- As the camshaft rotates, the lobe, or high spot of the cam, pushes against parts connected to the stem of the valve.当凸轮轴旋转时，凸轮凸起的或者高点的位置，推动气门座。
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