词根：equ(iqu) = equal, same 相同, 相同
来源于拉丁语形容词aequus,意为equal,same。这个词根与其它词根构词时，常还有连接字母（中缀）-i-,也可以把equi看作是equ的变体。词根equ的变形还有iqu。同义词根有来源于拉丁语的sembl,simil/simul,par,ident等和来源于希腊语的tauto。
同源词：
1. adequate [在相同的、同等的事物上添加的ad(=to,add)+equ(=equal)]
adj. 适当的；足够的
adequacy n. 适当；足够
adequately adv. 适骞地；足够地
My mother always reminds me of taking an adequate supply of socks to camp. 我妈妈常常提醒我：去野营时一定要带够袜子。
2. equitable [使能够同等的equ(=equal,same)]
adj. 公正的，公平的；[律]衡平法的
equity n. 公正，佘平；衡平法；(pl．)股息不定的普通股
equitabiy adv. 公正地，公平地
ex) The divorcing couple negotiated an equitable property settlement．那时离婚的夫妇就公平的财产分配达成了协议。
3. equivocate [发出同样的声音aqu(=equal,same)+voc(=call,voice)]
vi 支吾，含糊其辞
equivocal adj. 歧义的；暧昧的，模糊的
equivocation n. 含糊其辞
equivocally adv. 含糊地
ex) Stop equivocating and get to the point! 别兜圈子了，快说重点！
4. inadequate [不是往同样的东西上添加的 in(=not)+ad(=to, add)+equ(=equal)]
adj. 不充分的；不适当的
inadequacy n. 不充分；不适当
inadequately adv. 不适当地；不充分地
His academic performance has been inadequate for several semesters running.他的学术研究成绩连续几个学期都不合格。
5. iniquity [不相同或不正确in(not) + iqu<equ(=equal，same)]
n. 不公正；邪恶；( pl．)不公正的行为；邪恶的行为
iniquitous adj. 不公正的；邪恶的
God banished Satan to hell for his iniquity 上帝因撒旦的邪恶行径而将他放逐至地狱。
6. equable
adj. 变化小的，稳定的；平和的
equable climate/disposition/temper 变化很小的气候/平和的性格/温和的脾气
7. equal
adj.相同的，同等的；平等的；胜任的 n. 同等的人；可匹敌的事物 v. 跟…相同；比得上
equally adv. 同样地，同等地；平等她
equal opportunity 均等的机会
equal opportunity employer 提供公平机会的雇主
ex) She has no equal in cooking. 在烹饪方面没有谁能和她匹敌。
Equal Rights Amendment （美田宪法的）平等权利修正案
8. equalitarian
adj. 平等主义的 n. 平等主义者
9. equality
n. 平等；同等；均等
10. equalize
v. 使相等；使平等 *ize(=make)
equalization n. 平等化；平等化
equalize tax burdens 均掉捐税负担
equalize income 使收入均等
11. equate
v. 等同；使相同 *ate(=make)
equate the possession of wealth to happiness 认为拥有财富就等于幸福
equate two quantities 使两个数量相同
12. equation
n. [数]方程式；等式；相等
13. equator
n. （the ～ ）赤道
14. equatorial
adj. 赤道的；赤道附近的
equatorial Africa 位于赤道附近的非洲
equatorial orbit 赤道轨道
Equatoria Guinea 赤道几内亚
15. equidistant
adj. 等距的 *di<dis(=away),St(=stand)
equidistant diplomacy 等距离外交
16. equilateral
adj. 等边的 *later(=side)
equilareral triangle 等边三角形
17. equilibrium
n. 平衡状态；均衡；（心情的）平静 *libr(=balance)
in a state of equilibrium 处于平衡状态的
scales in equilibrium 平衡的天平
maintain /lose equilibrium（保持／失去平衡）
18. equinox
n. 昼夜平分时，春分或秋分 *nox(=night)
autumnal/spring equinox 秋/春分
19. equinoctial
n. 昼夜平分的，春分或秋分的 *noct(=night)
equinoctial circle/line 天（球）赤道
equinoctial point 二分点
oquinoctial gales/tides 二分点风暴/分点湖
20. equipoise
n. 平衡，均衡；平衡物；秤锤 *pois<pos(=put)
21. equivalent
adj.同等的几同等物；相当物；意义相同的词（或符号、表达法等）*val(=worth)
equivalent to an insult 等于辱骂的
the Korean equivalent of "thank you” 和“thank you”相对应的韩语
noun equivalent 相当于名词的形式
22. equivalence/-ency
n. 等同；等价 *val(=worth)
23. inequality
n.不平等；不同；不均衡；不等式 *in(=not)
the inequality between the rich and the poor 贫富间的不平等
24. inequitable
adj. 不公平的，不公正的 *in(=not)
inequitable division of the profits 不公平的收益分配
25. inequity
n.不公平，不公正 *in(=not)
26. unequal
adj. 不同的；不公平的 *un(=not)
27. unequalled
adj. 无与伦比的 *un(=not)
28. unequivocal
adj. 明确的，不含糊的 *un(=not),voc(=voice,call)
词根词缀：doul-, dulo-, dul-
【来源及含义】Greek: slave, servile, slavish; servitude; serving
【相关描述】A doula supports a woman and her family in achieving the kind of birth that they desire. A doula works in homes, hospitals, and birth centers; and gives, emotional, physical, and informational support. A careprovider, be he/she a midwife, OB/gyn, or family practitioner, will take care of a woman's prenatal care and birth. A doula is supposed to ensure that someone is always available to look after the mother-to-be emotionally. These objectives are facilitated by communication between the laboring woman, her partner, and her clinical care providers.
As a supportive companion (other than a friend or loved one) a doula is professionally trained to provide birth-labor support. She performs no clinical tasks. A doula also refers to lay women who are trained or experienced in providing postpartum care—mother and newborn care, breastfeeding support and advice, cooking, child care, errands, and light cleaning—for the family. To distinguish between the two types of doulas, one may refer to "birth doulas" and "postpartum doulas".