前缀 eu-

汉：来源于希腊语境，意为"good,well"。前缀dys 与eu意思相板，意为"bad ,ill"。
英：word-forming element in modern use meaning "good, well," from comb. form of Gk. eus "good," eu "well" (adv.), also "luckily, happily," from PIE *(e)su- "good" (cf. Skt. su- "good," Avestan hu- "good").

1.eugenics
n. science of the production of healthy offspring with the aim of improving the human genentic stock优生学；人种改良学 *eu(=good),gen (=birth,race)
例句：Some fear research in biotechnology,will inevitably lead to the advancement of eugenics.有人担心生物科学的研究会不可避免地导致优生学的发展。
2.eulogistic
adj.giving or containing high praise 颂词的，颂扬的 *eu(=good),log(=speech)
例句：No matter what terrible things the boys did,their mother was always eulogistic when talking about them.不管孩子们做了多么糟糕的事情，母亲在谈到他们的时总是对他们赞叹不已。
3.eulogize
v.praise highly in speech or writing 称赞，颂扬 *eu(=good),log (=speech)
例句：Atter ten minutes of eulogizing the team,Coach Smith presented us with the trophy.在对我们队称赞了十分钟后，史密斯教练给我们颁发了奖品。
4.eulogy
n.tribute,high raise 颂词；颂文 *eu(=good),log(=speech)
例句：I've been asked to deliver the eulogy at Harry's funeral.我受委托在哈里的葬礼上致掉词。
5.euphemism
n.use of other mild,vague and indirect words or phrases in place of what is required by truth or accuracy 委婉的说法，婉转语 *eu(=good ),phe(=say)
例句："Decided to seek our own lives" was the euphemism Margaret used when reterring to her divorce from Frank.“决定寻找我们自己的生活”是玛格丽特提到她和弗兰克离婚时所用的婉转用语。
6.euphony
n.a pleasant sound 悦耳之音，华美的音乐 *eu(=good),phon(=sound)
例句：We sat under a tree listening to the euphony of summer locusts.我们坐在树下倾听蝗虫在夏天奏出美妙的音乐。
7.euphonious
adj.pleasing in sound <-->cacophonous 悦耳的 *eu (=good),phon (=sound)
例句：When the caller is put on hold,he hears a euphonious symphony selection.
8.euphoria
n. sense of well-being;elation 幸福感；意气风发 *eu (=good ),phor (=carry)
例句：She was full of euphoria after the birth.她自出生起就充满了幸福感。
9.euthenics
n.science dealing with improving living conditions环境改善学 *eu(=good),then(=swell)
例句：There is a growing interest in the study of euthenics among today's cllege students.现如今，越来越多的大学生开始对环境改善学感兴趣。