详细解释:n. 骑手, (文件后的)附件, 扶手
【化】 游码
【医】 骑马者, 游码(精密天平上用)
【经】 追加条款, 附文
英语解释：
名词 rider:
a traveler who actively rides an animal (as a horse or camel)a clause that is appended to a legislative billa traveler who actively rides a vehicle (as a bicycle or motorcycle)a traveler riding in a vehicle (a boat or bus or car or plane or train etc) who is not operating it同义词：passenger