Post-horn邮号
post horn n旧时驿车到站时用以吹号的
rudder-post horn方向舵支柱摇臂
horn lecl post角铅
N（名词） a simple valveless natural horn consisting of a long tube of brass or copper, either straight or coiled; formerly often used to announce the arrival of a mailcoach (旧，用于宣告邮车抵达的)驿车铜号