词根：est, ess, ent = to be（存在）
来自拉丁语的esse 意to be。
同源词：
1. disinterested（两人之间不存在什么的dis(=not) + inter(=between) + est(=to be)）
adj.无私的；公正的；不关心的
A trial judge is ,ideally,a disinterested party —— an advocate of neither side. 理想状态下，审判官应当是无私的，不支持双方中任何一方。
2. nonentity（不存在 non(=not) + ent(=to be)）
n.不存在的东西；无足轻重的人
He's nonentity in the Democratic Party .他在民主党内无足轻重。
3. uninterested
adj.没有兴趣的；不关心的 *un(=not) ,inter(=between)
4. uninteresting
adj.无趣的；引不起兴趣的
5. interest
n.关心；兴趣，趣味；权益；利息；(pl.)利益 v.引起... 的兴趣；引起...的注意 *inter(=between)
French interests in Algeria 法国在阿尔及利亚的权益
interest rate 利率
pay 6% interest on loan 付6%的贷款利息
annual interest 年利息
simple /compound interest 单利/复利
high/low interest 高利/低利
6. interested
adj.感兴趣的；有利害关系的；有私心的，有偏见的 *inter(=between)
interested look 感兴趣的表情
interested spectators 感兴趣的观众们
interested marriage 利益婚姻
interested motives 私心
7. interesting
adj.有趣的；引起兴趣的 *inter(=beween)
interesting men /books /conversation 有趣的人/书/谈话
8. intestine
n.(pl.)肠 *int(=within)
small/large intestine 小肠/大肠
intestinal disorders 肠疾
intestinal canal 肠道
intestinal worm 肠内寄生虫
intestinal fortitude 勇气，毅力
9. essence
n.本质，要素；精髓，（从某种物质中提取出来的）精华；香料
essence of democracy 民主主义的本质
in essence 本质上
meat essences 肉精
essence of peppermint 薄荷精
10. essential
adj.必要的，不可缺少的；最重要的；本质的，实质的；基本的；精华的 n.(pl.)本质；要素
essentially adv. 实质上，本来
Wanted,a good secretary:experience essential 招聘秘书：要求有经验
11. quintessence
n.精髓，精华；典型；第五元素（earth,air ,fire,water,aether五要素中的第五项，即aether） *quint(=five)
quintessence of virtue /politeness 美德的典范/讲礼貌的典范
12. entity
n.实体（与性质等相对），存在
词根：dub(doub) = uncertain
来自拉丁语的dub意为uncertain。其变形为doub。
同源词：
1. redoubtable（完全不正确或不明确的re(=intensive) + doub<dub(=uncertain)
adj.可怕的；令人敬畏的
Many modern politicans continue to quote the redoubtable Winston Churchill.很多现代政治家还在继续引用令人敬畏的温斯顿.丘吉尔的话。
2. indubitable（不是不确定的in(=not) + dub(=uncertain)
adj.不容置疑的，明确的
The indubitable conclusion is that you're either drunk or stoned.结论毫无疑问：你喝醉了或已烂醉如泥。
3. dubious
adj.可疑的；半信半疑的；未定的，无把握的；暧昧的，含糊的；名声不好的
dubious compliment 明褒实贬的恭维
dubious blessing 令人怀疑的祝福
dubious character 名声不好的人
4. dubiety
n.怀疑
词根词缀：acantho-, acanth-, -acanth, -acanths, -acanthid, -acanthous
【来源及含义】Greek: used either as a prefix or as a suffix; pointed appendages; spine, spiny; thorn, thorny
【同源单词】acanth, acantha, acanthaceous, acanthamebiasis, acanthamoeba, acanthesthesia
词根词缀：bi-, bin-, bino-, bis-
【来源及含义】Latin: two, twice, double, twofold; a number; it normally functions as a prefix
【相关描述】This bi- is used before s, c, or a vowel. Don't confuse this bi- with another one which means "life".
All words except biennial referring to periods of time and prefixed by bi- are potentially ambiguous. Since bi- can be taken to mean either "twice each" or "every two", a word like "biweekly" can be understood as "twice each week" or "every two weeks".
【同源单词】biacid, biangular, biannual, biannual, biarchy, biarticulate
词根词缀：choreo-, chore-, chorei-, choro-, -choreatic, -chorea, -choreal, -choreic
【来源及含义】Greek: dance; involuntary movements; spasm; in medicine, it is used to indicate a nervous disorder either of organic origin or from an infection
【同源单词】chorea, choreal, choreic, choreiform, choreograph, choreographed
词根词缀：fem-, femi-
【来源及含义】Latin: woman, women; not masculine: neither man nor men
【相关词根词缀】 Related "woman, female" units: anilo-; gyno-; mulie-; virgo-.
【同源单词】anti-feminist, bonne femme, covert-feme, defeminize, ecofeminism, ecofeminist
词根词缀：gehenna-
【来源及含义】Hebrew > Greek > Latin: hell or hellfire
【相关描述】Moloch [MOH luhk] or Molech (Hebrew, melech: king). He was the god of the Ammonites, to whom children were made "to pass through the fire" as sacrifices. Children were dedicated ("passed over") and burned to Molech at the Tophet in the Valley of Hinnom near Jerusalem.
During the monarchical period of the Hebrews, the site was an infamous high place (called "topheth" and derived from an Aramaic word meaning "fireplace"), where some of the kings of Judah engaged in forbidden religious practices, including human sacrifice by fire; as mentioned earlier.
Probably because of these associations with fiery destruction and judgment, the word "Gehenna" came to be used metaphorically as a designation for hell or eternal damnation. As such, Gehenna is to be distinguished from Hades, which is either the bode of all the dead in general or the place where the wicked await the final judgment. In the New Testament, Gehenna designates the place or state of the final punishment of the wicked. It is variously described as a fiery furnace, an unquenchable fire, or an eternal fire prepared for the devil and his angels.
【相关词根词缀】 Cross references of word groups that are related, directly, indirectly, or partly to: "fire, burn, glow, or ashes": ars-, ard-; -bust; cand-, cend-; caust-, caut-; crema-; ciner-; ether-; flagr-; flam-; focus, foci-; fulg-; ign-; phleg-; phlog-; pyreto-, -pyrexia; pyr-; spod- (ashes; waste); volcan-.
【同源单词】gehenna, gehenne, gehennical
词根词缀：-itis
【来源及含义】Greek: a suffix; inflammation, burning sensation; by extension, disease associated with inflammation
【相关描述】This suffix has come to mean "inflammation of" but originally it meant "pertaining to" or "of the". The Greek word nosos ["disease"] was either expressed or understood, although it might not be included with the basic element. For example, bursitis nosos would mean "disease of the bursa".
【同源单词】actilnoneuritis, adenitis, adrenalitis, allergyrhinitis, angioitis, angiopancreatitis
词根词缀：masto-, mast-, -mastia, -masty
【来源及含义】Greek: breast; the front of the human chest and either of two soft rounded organs on each side of the chest in women and men; however, with women the organs are more prominent and produce milk after childbirth; also, a milk-producing gland in mammals that corresponds to the human breast
【相关词根词缀】 Cross references of word families that are related, partially or totally, to: "breast, breasts, chest": mammill-; mammo-; mastoido-; mazo-; pectoro-; pleuro-; sterno-; stetho-; thorac-.
【同源单词】acromastitis, amastia, anisogynecomastia, anisomastia, bimastism, double mastectomy
词根词缀：neutro-, neuter-, neutr-, neut-
【来源及含义】Latin: neither of two; neither one nor the other
【同源单词】general neutral, net neutrality, neuter, neuterize, neuteroid, neutral