1.duplicate a.复制的(being the same as another);n.复制品(an additional copy of something already in a collection)a.复制的(to makea copy of);重复(to do again often needlessly)

词根记忆：du+plic(重叠)+ate一使重叠--复制

例：Cyprus（塞浦路斯）would become the primary source of marketable duplicate artifacts.//The secretar}t dupkcated the documents for her boss.

派生词：duplication(n.副本；复制)

2.duplication n.复制(the act or process of duplicating)；副本(counterpart)

例：This priority might often lead them to be less vigilant in streamlining their services-eliminating duplication between departments, for instance.

3.durability n.经久，耐久性(existing for a long time without significant deterioration)

词根记忆：dur(持续)+ability(能力)--持续的能力--耐久性

例：Nylons have the virtue of durability.

4.duration n.持续，持久(continuance in time)

词根记忆：dur(持续)+ation(表状态)--持续，持久

例：The brightening of such a star is observed to be of shorter duration than the brightening of neighboring stars.

同根词：endurance(n.忍耐力;持久)

5.dwarf n.矮子(a person of unusually small stature);v.（使）变矮小(to cause to appear smaller or to seem inferior)

联想记忆：战争(war)使战败国在战胜国面前相形见绌(dwarf)

例：white dwarf star白矮星//The giant oak dwarfed the seedling.

6.dwelling n.住处，寓所(residence)

词根记忆：来自dwell(v.居住)

例：For protection from the summer sun, the Mojave lived in open-sided, flat-topped dwellings.

7.dwindle v.变小(to diminish, to shrink, to decrease)

联想记忆：d+wind(风)+le--随风而去越来越小--变小

注意：不要和swindle(v.欺骗，诈骗)相混

例：Contrary to financial analysts' predictions last year that the market for home computers would dwindle, the personal computer industry continued to show strong growth in the first quarter of this year.

8.dye n．染料(a substance used to color materials);v.给…染色(to color,especially by soaking in a coloring solution)

例：Dyes can be made from plants or from chemicals.//Each of the eggs in the bowl is dyed red, green, or blue.

9.dynamic n.动力(an underlying cause of change or growth);[常pl.]动态(a pattern or process of change, growth, or activity)

词根记忆：dynam(力量)+ic--有力量的--动力：动态

例：market dynamics市场活力//population dynamics人口动态

同根词：dynamo(发电机)；dynamite(炸药)

10.ease v.缓和(to alleviate)；n.不费力（effortlessness）

例：The drugs eased my pain.//She picked up her second gold medal with ridiculous ease.

派生词：easing(n.放松)