1 [C] a wooden or metal bar fixed to a wall, which you can hang things on (固定在墙上用来挂物件的)横杆,横档:
a towel/curtain/picture rail挂毛巾╱窗帘╱图画的横杆☞picture on page C7 见C7页插图
2 [C] a bar which you can hold to stop you from falling (on stairs, from a building, etc) (楼梯等的)栏杆,扶手
3 [C] [usu.pl] each of the two metal bars that form the track that trains run on 铁轨;轨道
4 [U] the railway system; trains as a means of transport 铁路系统;火车:
rail travel/services/fares乘火车旅行;列车服务;火车票价