A mechanical device used to control passage from one public area to another, typically consisting of several horizontal arms supported by and radially projecting from a central vertical post and allowing only the passage of individuals on foot.是什么意思_A mechanical device used to control passage from one public area to another, typically consisting of several horizontal arms supported by and radially projecting from a central vertical post and allowing only the passage of individuals on foot.在线翻译_英语_读音_用法_例句