1.dosage n.剂量(the giving of a dose)

词根记忆：来自dose(v.给药;给…服药)

例：a dosage of a prescribed drug一剂处方药

同根词：dosimetry(n.剂量学)

2.dose n.（药的）剂量（measured quantity of medicine）；一服(an amount of something likened to a prescription)

例：The medicine costs less per dose than that one.

派生词：dosage(n.剂，剂量)

3.dough n．生面团(a mixture that consists essentially of flour or meal and a liquid and is stiff enough to knead or roll)

联想记忆：硬硬的(tough)的生面团(dough)

例：bread dough生面团

4.downplay v.贬低，不予重视(to de-emphasize)

例：The individualist feminist tradition downplays the importance of gender roles.

5.downstream ad.顾流而下，朝下游方向(in the direction of or towards the mouth of a stream)

词根记忆：down(向下的)+stream(溪，流)--顺流而下

例：The leaf fell off the tree and floated dovmstream.

6.drab a．土褐色的(of a dull light brown)

词根记忆：和grab(v.夺取)一起记

7.draft n.草稿，草案（preliminary written version of sth.）；汇票(written order to a bank to pay money to sb.)

例：When Elizabeth Cady Stanton drafted the Declaration of Sentiments that was adopted at the Seneca Falls Women's Rights Convention in 1848, she included in it a call for female entranchisement.

8.drainage n.排水(the act or method of drawing off)；排水系统(a system of drains)；污水(sth. drained off)

词根记忆：drain（排水）+age(名词后缀)一排水

例：Changes in land use and drainage patterns around the lake mean that the lake's waters are increasingly likely to be affected by agricultural runoff.

9.dramatize V.（使）姑呃锄化(to present or represent in a dramatic manner)

词根记忆：drama(戏剧)+tize--戏剧化

例：The television movie dramatized the historical event.

10.drastic a．激烈的，剧烈的(severe)

例：Desertification(沙漠化)is not always the result of drastic climate changes alone.

派生词：drastically(ad.激烈地；彻底地)