cam/kæm; kæm/ nprojecting part on a wheel designed to change the circular motion of the wheel as it turns into up-and-down or backwards-and-forwards motion of another part 凸轮（轮上的凸起部件, 用以使轮的圆周运动转变成另一部件的上下或前後运动）.
牛津英汉双解词典