Means must be provided for keeping the follower in contact with the cam surface.

必须提供手段保持从动件与凸轮表面接触。

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The cam follower always contacts the cam surface at a single point or along a single line.

凸轮从动总是接触凸轮表面的单点或沿一条直线上。

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For the purpose of precision CAM design, it is critical to speculate the actual CAM surface.

在高精度凸轮的设计过程中，需要实现凸轮实际轮廓曲面的精确设计。

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The company's first ruggedized underwater cam was a solid snapper, but its bulky submarine-like design made it impractical for most surface-based shoots.

ENGADGET: Canon PowerShot D20 ruggedized point-and-shoot camera hands-on (video)