词根：cret, cern(creet, cre) = to observe（观察）to sift（筛选）
cret,cern为同源异形根，来自拉丁语的cernere意为to observe,to sift,to separate,cern是不定式词干，常构成动词，cert是动名词词干，多出现于名词或形容词，它们的变形为creet ,cre。此外，意为to grow ,to increase的
cre,cru与这两词根的形态相似，注意不要混淆。
同源词：
1. discretion （分别观察 dis(=apart) + cret (=observe,separate)
n.慎重；判断力；决定或行动的自由
discretionary adj.任意的，自由决定的
It's important to use discretion when disciplining an underperforming employee. 在处罚工作表现不佳的职员时慎重考虑是非常重要的。
2. discern（分别切开使分开dis(=apart) + cern(=separate)）
vt. 分辨，识别；察觉出
discernment n.洞察；识别
discerning adj.有辨别力的
discernible adj.可辨别的
You can barely discern the white fences in the snow banks. 在雪堆中很难看出哪里是白栅栏。
3. discreet（个别分出）*dis(=apart),creet<cret(=separate,observe)
adj.谨慎的，慎重的，深思熟虑的
maintain a discreet silence 谨慎地保持沉默
4. discrete
adj.分离的；不连续的 （一个二个地分开）*dis(=away)
5. decree
n.法令；命令；判决；天使
v.颁布；注定
*de(=apart,away),cre<cret(=observe)
issue a decree 颁布一项法令
6. excrement
n.排泄物；(pl.)烘便，肥料 *ex(=out),cre<cret(=separate)
7. excreta
n.排泄物；分泌物；（特指）粪便 *ex(=out)
8. secret
n.秘密；机密（to secret（绝密，高密），secret（一级机密，机密），confidential（二级机密，秘密），restricted （三级机密，受限）；秘方；秘诀；奥妙，神秘
adj.秘密的，不为人所知的；（地点）偏僻的，隐蔽的 *se(=away,apart)
secret police 秘密警察
9. secrecy
n.秘密（性）；保密，守口如瓶 *se(=away,apart),cre<cret(=observe,separate)
promise secrecy 承诺保密
10. secrete
v.分泌；躲藏，隐藏，隐匿 *se(=away,apart)
secrete cell 分泌细胞
11. secretion
n.分泌（作用）；分泌物（如唾液、胆汁等）；藏匿，隐藏 *se(=away ,apart)
secretion of stolen goods 藏匿偷来的赃物
12. secretive
adj.隐藏的；（对自己的想法、感情、意图等）遮遮掩掩的 *se(=away,apart)
13. secretary（拆开便可知它是由se- 分离 + cert 筛选 + ary 人 -->分先的人。这是从秘书把重要物品、消息隔离，不让众人接触的含义引申而来。）
n.秘书；书记；干事；<美>部长 *se(=away,apart)
Secretary Gengeral （联合国等大型机构的）秘书长
Secretary of State <英>国务大臣；<美>国务卿
14. secretarial
adj.秘书的，书记的；秘收（或书记）工作的 *se(=away,apart)
secretarial duties/colleges 秘书的职责/文秘学校
15. secretariat
n.秘收处，书记处 *se(=away,apart)
get a position on the secretartiat of UNO in New York .在纽约联合国秘书处谋求一个位置
16. concern
v.涉及；关心；（使某人）担忧，担心 n.关系；重要的事；商行；利害关系；担心，忧虑 *con<com(=together,intensive)
so/as far as i am concerned 关于我，至于我，就我而言
To whom it may concern （用做正式信件的开头）敬启者
17. concerned
adj.担心的，忧虑的；有关的，相关的 *con<com(=together,intensive)
with a concerned look 一副担忧的表情
the authorities concerned 有关当局
the parties concerned 有关方
18. concerning
prep. 关于... *con<com(=together,intensive)
concerning the matter 关于那件事
词根：tegr = to touch
来自拉丁语的tegr 意为to touch。
同源词：
1. integrity（不被触摸、接触的状态 in(=not) + tegr(=touch)）
n.诚实，正直，高洁；完全
integrate v.使整体；使一体化；取消种族隔离
integration n.综合，完成，集体所必需的；[数]整数的；积分的
Dr.Stanton is a man of unquestioned integrity to whom i entrust my life.毫无疑问，斯坦顿医生是一个正直的人，值得我托付终身。
2. disintegrate
v.使分解；使瓦解，使崩溃 *dis( =not,away),in(=not)
disintegration n.分解，分裂；崩溃；[地]剥溃
rocks disintegrated by and ranin 被霜冻和雨水剥蚀的岩石
3. redintegration
n. 复原；重建 *red<re(=again),in(=not)
vedintegrate v.复原；重建
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：serico-, seric-, seri-
【来源及含义】Greek > Latin: silk
【相关描述】From Greek, serikos, silken; literally, pertaining to the Seres, the Asian people from whom the Greeks first obtained silk. Don't confuse this seri- with another seri- in "serial" or "series" and serio- in "serious", etc.
【同源单词】holosericeous, sericate, sericeous, sericigenous, sericin, sericipary