1N-COUNT (铁路线的)侧线,岔道 A siding is a short railway track beside the main tracks, where engines and carriages are left when they are not being used. (铁路线的)侧线,岔道
2N-UNCOUNT (建筑外墙的)墙板,壁板Siding is a wooden or metal covering on the outside walls of a building. (建筑外墙的)墙板,壁板 [US]