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]