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。The engine was panting noisily as it stood on the tracks.火车头停在轨道上时发出嘈杂的喷气声。The trolleybus does not run on tracks.无轨电车不在轨道上行驶。The satellite will remain in orbit for several years.这颗卫星将在轨道上运行数年。