1.deleterious a.（对身心）有害的(injurious)

联想记忆：delete(删除)+rious一对身心有害的定要删除一有害的

例:Efforts to control the spruce budworm have had deleterious effects on the red-osier dogwood.

2.deliberate a．深思熟虑的(characterized by or resulting from careful and thorough consideration)；蓄意的(voluntary)

词根记忆：de+liber(自由)+ate--按自由意志的--蓄意的

例:The deliberate selective breeding produced modern domesticated sheep.//The deliberate and even brutal aggression integral to some forms of competitive athletics increase the likelihood of imitative violence.

同根词：liberality(n.自由，慷慨)；liberty(n.自由)

3.delicacy n.美味，佳肴（sth. pleasing to eat that is consdered rare or luxurious）；精妙(the quality or state of being luxurious)

词根记忆：来自delicate(a.精美的；可口的)

例:A special Japanese green tea called genmai-cha contains brown rice and is considered as adelicacy fit for a gourmet by most Japanese, though it is virtually unavailable outside Yokohama.

4.delicate a．微妙的（subtle);精致的(pleasirg to the senses);脆弱的(fragile)

词根记忆：de+lic(引诱)+ate--再引诱人的--精致的

例:The new variety of wheat had a more delicate flavor.//Tom was a delicate child who is often ill．

5.delineate v.描画(to i rdicate or represent by drawn or painted lines);描给轮廓(to mark the outline of)

联想记忆：de+line(线条)+ate--用线条画--描画

例:An argument is delineated, followed by a counterargument.

6.delinquent n.行为不良的人（a delinquent person);a.拖欠的(being overdue in payment）；违法的（offending by neglect or violation of duty or of law)

词根记忆：de+linqu(离开)+ent--离开自己的岗位--失职--违法的

例:The bank holds $3 billion in loans that are seriously delinquent.//delinquent behavior违法行为

派生词:delinquency(n.逾期债款)

7.deliver v.支付（to take and hand over to or leave for another)递送（to send);实现(to come through with)

词根记忆：de（离开）+live(举起)+r--举起然后拿走--递送

例:In Borania many people who want to quit smoking wear nicotine skin patches, which delwer small doses of nicotine through the skin.

派生词:delivery(n.交付;递送)

And gladly would learn.and gladly teach.
勤于学习的人才能乐于施教。

——英国诗人乔叟(Chaucer, British poet)