1.delta n.（河流的）三角洲(the alluvial deposit at the mouth of a river)

詞根記憶：本身是希臘語的第四個字母“△”，也指形狀像△的河流的三角洲

例:The Hyksos(希克索斯王)invaded the Nile Detta of Egypt and ruled it from 1650 B.C.

2.deluxe a．豪華的( notably luxurious, elegant, or expensive)

詞根記憶：de+luxe(光)一閃閃發光的一豪華的

例:Our company started manufacturing and marketing adeluxe air filter six months ago.

3.delve v.鉆研，深入探索(to make a careful search for information)

聯想記憶：整天埋在書架(shelves)里鉆研(delve)

例:The investigator delved into the matter of Tom's sudden wealth.

4.demobilization n.遣散（軍人）（discharging from military service)；復員

詞根記憶：來自demobilize(v.復員)，de+mobilize(動員)--動員回家--復員

例:The bill was passed to help the nation's demobilization effort.

同根詞：mobility(n.能動性)

5.democracy n.民主,民主主義;民主政治(government by the people)

詞根記憶：demo(人民)+cracy(統治)一人民統治一民主

例:Many scholars have theorized that economic development, particularly industrialization and urbanization, contributes to the growth of participatory democvacy.

同根詞：demography(n.人口統計學)

6.democrat n．民主主義者(an adherent of democracy); [D-]美國民主黨人

詞根記憶：demo(人民)+crat一民主主叉者

例:A certain state legislature consists of 124 members, each of whom is either a Democrat or a Republican.

派生詞:democratic(a.民主的：民主主義的)：democratically(ad.民主地：民主主義地)

7.demographer n.人口統計家( expert in demography)

詞根記憶：demo(人民)+graph（寫）+er一人口統計學家

例:Demographers are doing research for an international economics newsletter claim.

派生詞:demographic(a．人口統計的)

8.demographic a.人口纈滲心擎臺9(of de-mography or demographics)

詞根記憶：demo(人民，人口)+graph(寫，畫)+ic--描寫人口狀況的--人口統計學的

例:The researchers dismissed demographic bias because older individuals were not overrepresented in the fossil samples.

同根詞：democracy(n.民主)

9.demonstrably ad.可證實地，顯然地(apparently, evidently)

詞根記憶：來自demonstrable(a．可論證的，可證實的)

例:That demonstrably slowed the economic growth of medieval France.

10.demonstrate v.證明(to prove by reasoning or evidence)；顯示(to show clearly)；示威游行（或集會）(to make a demonstration, to participate in a public display of opinion)

詞根記憶：de（加強）+monstr(表示)+ate(做)一加強表示一證明

例:Her work aims to demonstrate that wage work enabled women to become aware of themselves as a distinct social group.//The citizens demonstrated against the new taxes.

派生詞:demonstrator(n.示威者；論證者)