cam
noun/kæm/
/kæm/
- a part on a wheel that sticks out and changes the circular movement of the wheel into up-and-down or backwards-and-forwards movement
凸轮（把圆周运动转变为上下或前后运动的机械部件） - (especially in compounds) (informal) a camera
相机；摄像机；摄像头 - a video/digital/traffic cam
摄像机；数码相机；交通摄像头 - The police now have helmet cams—small video cameras attached to their headgear.
警察现在配备了头盔摄像头——安装在头盔上的小型摄像机。
- a video/digital/traffic cam
Word Originlate 18th cent.: from Dutch kam ‘comb’, as in kamrad ‘cog wheel’.