ascender上升物ascendv.上升；攀登ascending paper partition上行纸分配ascending chromatrography上行层析法ascending cervical artery颈升动脉ascending luminance steps上升亮度阶梯ascending posterior branch后升支ascend to a former century追溯到前一世纪ascending reticular system上行性网状系统Ascend the flight of steps登阶,跨过台阶Ascending ileocolic artery回肠结肠升动脉ascending part of duodenum十二指肠升部