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1.unravel v.解開，拆散(to resolve the complexity of)
詞根記憶：un(打開，解開)+ravel(糾纏)--解開糾纏--解開
例：The study of the fruit fly, a household nuisance but a time-honored experimental subject, has enabled scientists to begin to unravel the secrets of how embryos develop.
2.unrealistic a，不切實際的，不實在的(not realistic)
詞根記憶：un(非)+real(真實的)+istic（…的）--不真實的--不切實際的
例：It would be unrealistic to suggest that illegal digging would stop if artifacts were sold on the open market.
3.unretfined a．未提煉的(the state of being not free from what is coarse, vulgar, or uncouth)
詞根記憶：un（非）+refine(提煉)+d(…的)--未提煉的
例：People who judge the quality of unrefined olive oils actually judge those oils by their acidity, which the judges can taste.
4.unreimbursed a．未償（付，賠）還(not paid)
詞根記憶：來自reimburse(v.償還，賠付)
例：United States hospitals have traditionally relied primarily on revenues to offset losses from unreimbursed care.
5.unscrupulous a.無道德原則的，不講道德的( unprincipled)
詞根記憶：un（表否定）+scrupulous(小心的)--不講道德的
例：an unscrupulous press無道德的新聞
6.unsubstantiated a．未經證實的，無事實根據的
詞根記憶：un（表否定）+substantiate(證實)+d--未證實的
例：Bailyn's fourth proposition is intriguing though unsubstantiated.
7.untainted a.無污點的
詞根記憶：un(表否定)+taint(污點)+ed--無污點的
8.untenable a．難以防守的：站不住腳的(not able to be defended)
詞根記憶：un(不能)+ten(拿住)+able--拿不住的--難以防守的
例：an untenable position--令難于防守的陣地//The researchers' conclusion is untenable.
9.unwarranted a．無根據的(not justified)
詞根記憶：un(不能)+warrant(保證)+ed--未經保證的--無根據的
例：This conclusion is unwarranted.
10.unwieldy a．麻煩的，難處理的(not easily managed, handled or used)
詞根記憶：un(不)+wieldy(支配的，控制的)--不可控制的--麻煩的
例：Since many satellites are built by unwieldy international consortia, inefficiencies are inevitable.
v. 闡明，解釋，解開
