set up ,set about , set down ,set out用法?set about ,set out区 ...答:set down: 记下I have set down all the things that happened. 我已将发生的所有事记了下来。set about 开始, 散布 set out 出发, 开始, 装饰, 陈列, 测定, 宣布, 移植, 陈述 set down 放下, 使下车, 使着陆, 登记, 把...归于, 击败, 把...看作, 记下 set up 设立, 竖立, ...