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1.updraft n. 上升氣流(an upward movement of gas(as air）
詞根記憶：up(向上)+draft(排水，排氣)--向上排氣--上升氣流
2.upheaval n.大變動(radical change)
詞根記憶：來自upheave(v.舉起，鼓起)
例：social upheaval社會大變動
3.upholstered a．裝軟墊的( to be furnished with or as if with upholstery)
例：upholstered chairs軟椅
4.upstate a．在州北部的(be in the northern sections of a state)
詞根記憶：up(上)+state(州)--地圖上位于州上方的--州北部的
例：upstate New York紐約州北部地區(qū)
5.upstream ad.向上游 a．位于上游的(in the direction opposite to the flow of a stream)
例：The distribution of water allocations for irrigation is to prevent farms upstream from using water needed by farms downstream.
6.upsurge n．急劇上升(a rapid rise)
詞根記憶：up(向上)+surge(波動)--向上波動--急劇上升
例：What accounts for this upsurge in unionization among clerical workers?
7.urbanization n．都市化(the quality or state of being urbanized or the process of becoming urbanized)
詞根記憶：來自urbanize(v.使都市化)
例：The populations of these cantons shared similar views because urbanization furthered the diffusion of ideas among them.
8.urbanize v.使…都市化（to cause to take on urban characteristics）
詞根記憶：urban（都市）+ize（…化）--使…都市化
例:The influx of new businesses urbanized the small town．
例：urbanization（n.都市化）
9.urchin n.海膽(any of numerous echinoderms that are usually enclosed in thin brittle globular tests covered with movable s pines)
例：sea urchin 海膽
n. 特性，特征；特質；特色（characteristi
