flange

n.凸缘; 法兰; (火车的)轮缘 复数：flanges过去式：flanged 牛津词典 noun 凸缘；法兰；（火车的）轮缘an edge that sticks out from an object and makes it stronger or (as in a wheel of a train) keeps it in the correct position 柯林斯词典 凸缘...