broker historical definition for Dummies
知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。expert, experient - owning encounter; obtaining information or ability from observation or participationoutdated - of extended period; not new; "previous custom"; "old household"; "previous wine"; "aged nation"; "aged friendships"; "previous revenue