1.devise v.想出(to think out)；設計，發明(to invent)

例:Several procedures were devised to reduce transaction costs.

2.devoid a．(of)空的，缺乏的( absent)

詞根記憶：de+void(空)一空的，缺乏的

例:The space between the galaxies is devoid of matter.

3.dexterity n.純熟，靈巧(skill and ease in using the hands)

詞根記憶：dexter(右)+ity一用右手做事--純熟

例:Manual dexterity and mental alertness are lower in the late night than they are during the day.

4.diagnose v.診斷(to recognize a disease by signs and symptoms)

詞根記憶：dia(穿過)+gnose(知道)--古時通過望、聞、問、切診斷病情，透過表面看實質一診斷

例:Angiograms(血管造影片)can be used to diagnose conditions other than blockages in arteries.

派生詞：diagnosis(n.診斷)：diagnostic(a．診斷的;判斷的)

5.diagnostic a．診斷的，判斷的(of, relating to, or used in diagnosis);n．診斷程序(the art or practice of diagnosis)

詞根記憶：來自diagnose(v.診斷)

例:Researchers have questioned the use of costly and experimental diagnostic tests to identify food allergies

6.diagonal n.對角線(a straight line than joins two opposite sides of sth. at an angle)

詞根記憶：dia(穿過)+gon(角)+al_+穿過兩個角的線-+對角線

例:The size of a television screen is given as the length of the screen's diagonal.

7.dialect n．方言，語調(a regional variety of language distinguished by features of vocabulary, grammar, and pronunciation from other regional varieties and constituting together with them a single language)

例:Cajuns speak adialect brought to southern Louisiana by the four thousand Acadians who migrated there in 1755.

8.diameter n.直徑(a straight line segment passing through the center of a figure, especially of a circle or sphere, and terminating at the periphery)

詞根記憶：dia（通過）+meter(量)--穿過它來測量直徑--直徑

注意：circumference(n.圓周長)

例:The diameter of the bicycle wheel was 0.5 meters.

9.diaper n.尿布

圓聯想記憶：di(分開)+aper(看作paper紙)--能把水分隔開的紙--尿布

例:disposable diapers一次性尿布

10.dichotomy n.一分為二(a division into two especially mutually exclusive or contra-dictory groups)

詞根記憶：dicho(二份)+tom(切、割)+y--切成二份--一分為二

例:the good bad dichotomy好與壞的二分法

派生詞：dichotomous(a．二分的；分叉的)