cam

n projecting 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）.

callus, calm, calm down, calmly, calmness, Calor gas, calorie, calories, calorific, calorimeter, calory, calumniate, calumnious, calumny, calve, calves, Calvinism, Calvinist, calypso, calyx, camaraderie, camber, cambric, Cambridge, camcorder, came, camel, camel-hair (also camel's-hair), camellia, Camembert, cameo, camera, cameraman, camomile (also chamomile), camouflage, camp, camp meeting, camp-bed (US campcot), camp-fire, camp-follower,