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1.updraft n. 上升气流(an upward movement of gas(as air）
词根记忆：up(向上)+draft(排水，排气)--向上排气--上升气流
2.upheaval n.大变动(radical change)
词根记忆：来自upheave(v.举起，鼓起)
例：social upheaval社会大变动
3.upholstered a．装软垫的( to be furnished with or as if with upholstery)
例：upholstered chairs软椅
4.upstate a．在州北部的(be in the northern sections of a state)
词根记忆：up(上)+state(州)--地图上位于州上方的--州北部的
例：upstate New York纽约州北部地区
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．急剧上升(a rapid rise)
词根记忆：up(向上)+surge(波动)--向上波动--急剧上升
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)
词根记忆：来自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）
词根记忆：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.海胆(any of numerous echinoderms that are usually enclosed in thin brittle globular tests covered with movable s pines)
例：sea urchin 海胆
n. 分发，分配，散布，分布
