duration N. /持续时间/length of time something lasts. Because she wanted the children to make a good impression on the dinner guests, Mother promised them a treat if they'd behave for the duration of the meal.
duress N. /(非法的)限制，关押/forcible restraint, especially unlawfully. The hostages were held under duress until the prisoners' demands were met.
dutiful ADJ. /恭敬的;尊重的/respectful; obedient. When Mother told Billy to kiss Great-Aunt Hattie, the boy obediently gave the old woman a dutiful peck on her cheek.
dwarf V. /使看上去矮小/cause to seem small. The giant redwoods and high cliffs dwarfed the elegant Ahwahnee Hotel, making it appear a modest lodge rather than an imposing hostelry.
dwindle V. /缩水;减少/shrink; reduce. The food in the life boat gradually dwindled away to nothing; in the end, they ate the ship's cook.
dynamic ADJ. /充满活力的/energetic; vigorously active. The dynamic aerobics instructor kept her students on the run; she was a little dynamo.
earthy ADJ. /粗糙的;未加工的/unrefined; coarse. His earthy remarks often embarrassed the women in his audience.
ebb V. /衰退/recede; lessen. Sitting on the beach, Mrs. Dalloway watched the tide ebb: the waters receded, drawing away from her as she sat there all alone. also N.
ebullient ADJ. /热情的，激动的/showing excitement; overflowing with enthusiasm. Amy's ebullient nature could not be repressed; she' was always bubbling over with excitement. ebullience, N.
eccentric ADJ. /古怪的，奇怪的/irregular; odd; whimsical; bizarre. The comet veered dangerously close to the earth in its eccentric orbit. People came up with some eccentric ideas for dealing with the emergency: someone even suggested tieing a knot in the comet's tail!
eccentricity N. /怪僻，古怪;特性/oddity; idiosyncrasy. Some of his friends tried to account for his rudeness to strangers as the eccentricity of genius.
ecclesiastic ADJ. /神职的/pertaining to the church. The minister donned his ecclesiastic garb and walked to the pulpit. also N.
eclectic ADJ. /折衷的/composed of elements drawn from disparate sources. His style of interior decoration was eclectic: bits and pieces of furnishings from widely divergent periods, strikingly juxtaposed to create a unique decor. eclecticism, N.
eclipse V. /超越;衰落;失色/darken; extinguish; surpass. The new stock market high eclipsed the previous record set in 1995.
ecologist N. /生态学家/a person concerned with the interrelationship between living organisms and their environment. The ecologist was concerned that the new dam would upset the natural balance of the creatures living in Glen Canyon.
economy N. /俭省节约的，经济的/efficiency or conciseness in using something. Reading the epigrams of Pope, I admire the economy of his verse: in few words he conveys worlds of meaning. (sec-ondary meaning)
ecstasy N. /全神贯注，入迷，高兴/rapture; joy; any overpowering emotion. When Allison received her long-hoped-for letter of acceptance from Harvard, she was in ecstasy. ecstatic,ADJ.
eddy N. /漩涡/swirling current of water, air, etc. The water in the tide pool was still, except for an occasional eddy.
edict N. /法令，号令;布告/decree (especially issued by a sovereign); official command. The emperor issued an edict decreeing that everyone should come see him model his magnificent new clothes.
edify V. /教导;启迪，陶冶/instruct; correct morally. Although his purpose was to edify and not to entertain his audience, many of his listeners were amused rather than enlightened.
eerie ADJ. /怪异的/weird. In that eerie setting, it was easy to believe in ghosts and other supernatural beings.
efface V. /抹掉/rub out. The coin had been handled so many times that its date had been effaced.
effectual ADJ. /有效的/able to produce a desired effect; valid. Medical researchers are concerned because of the development of drug-resistant strains of bacteria; many once useful antibiotics are no longer effectual in curing bacterial infections.
effervescence N. /泡腾，沸腾;兴奋，活泼/inner excitement or exuberance; bubbling from fermentation or carbonation. Nothing depressed Sue for long; her naturaleffervescence soon reasserted itself. Soda that loses itseffervescence goes flat. effervescent, ADJ. effervesce,V.
efficacy N. /功效/power to produce desired effect. The efficacy of this drug depends on the regularity of the dosage. efficacious,ADJ.
effigy N. /假人(被人憎恨的，如秦桧)/dummy. The mob showed its irritation by hanging the judge ineffigy.
effrontery N. /厚颜无耻/shameless boldness. She had the effrontery to insult the guest.
effusive ADJ. /激情澎湃的/pouring forth; gushing. Hereffusive manner of greeting her friends finally began to irritate them. effusion, N.
egoism N. /自我中心，利己主义/excessive interest in one's self; belief that one should be interested in one's self rather than in others. His egoism prevented him from seeing the needs of his col-leagues.