1.dictate v.規定，支配(to impose, or specify authoritatively)

詞根記憶：dict(說)+ate--規定

例:Capitalists who owned enough stock to dominate the board of directors always dictate company policy.

2.diesel n．內燃機，柴油機(a diesel engine)

詞根記憶：由德國的發明家Diesel(狄賽爾)而來

派生詞：diesel fuel柴油

3.dietary a．飲食的(of or relating to a diet or to the rules of a diet)

詞根記憶：來自diet(n.飲食)

例:When maize was introduced into southern Europe, it quickly became a dietary staple.

4.differentiate v.區別(to mark or show a difference in)；【生】分化(to undergo a pro-gressive, developmental change to a more specialized form or function)

詞根記憶：來自different(a．不同的)

例:Improved customer service is the best way for us to differentiate ourselves from competitors.,,The hormones will cause plant cells to differentiate to perform different functions.

5.differentiation n.變異（the act or process of differentiating）；分化;區別(a discrimination between things as different and distinct)

詞根記憶：來自differentiate(v.區分)

例:While studying the genetic makeup of com, Barbara McClintock discovered a new class of mutant genes,a discovery that led to greater understanding of cell differentiation.

同根詞：differentially(ad.區別地)

6.digest v.消化(to convert( food) into absorbable form);吸收( to absorb; to take into the mind or memory)n.摘要【a summation or condensation of a body of information)

詞根記憶：di（向下）+gest(運)--將食物向下運--消化

例:If proteins are taken orally, they are digested and cannot reach their target cells.

派生詞：digestion(n．消化力)：digestive(a．消化的)

7.digit n.數字(number)；【數】十位數

例:the tens digit

派生詞：digitize(v.將…數字化)；digital(a．數字的)

8.digtize v.數字化(to convert( as data or an image) to digital form)

詞根記憶：digit(數字)+ize--數字化

例:The sound emissions were digitized and analyzed on computers.

同根詞：digital(a．數字的；手指的)

9.dilemma n.困境，左右為難（a problem involving a difficult choice）

發音記憶：“地雷嘛”--被陷雷區，進退兩難--困境

例:The company solved its globalization dilemma effectively by forging alliances with the best foreign partners.

10.dilute v.沖淡，稀釋(to make thinner or more liquid by admixture)

例:Those concentrated cleaning products must be diluted before using them.

派生詞：dilution(n.稀釋，滲水)