flange
noun [ C ] uk/flændʒ/ us/flændʒ/
凸缘；法兰；轮缘
a flat surface sticking out from an object, used to fix it to something or to make it stronger
The flange around the wheels on railway trains helps to keep them on the rails. 火车轮的轮缘能将车轮卡在轨道上。