1.aurora n．極光(bands of coloured light seen in the sky at night near the North Pole and caused by electrical radiation)

注意：aurore(a.朝霞色的)

例:Displays of the aurora borealis(北極光)can heat the atmosphere over the arctic.

2.austere a.嚴(yán)格的，節(jié)制的(strict or severe in discipline)

詞根記憶：au+ster(冷)+e--冷面孔--嚴(yán)格的

例:The austere professor never smiled.//The austere budgets have caused the slowdown in the growth in state spending.

派生詞:austerity(n.嚴(yán)格；國家開支上的緊縮)

3.authentic a．真正的(genuine; real);法律證實的(legally attested)

詞根記憶：authent( =author作家)+ic一自己就是作家一真正的

例:Although many art patrons can readily differentiate a good debenture from an undesirable one, they are much less expert in distinguishing good paintings and poor ones, or authentic art and fakes.

派生詞:authentically( ad.真正地：確實地)

4.authenticate v.證明…是真的(to confirm)

詞根記憶：來自authentic(a．真的：真正的)

例:We authenticate the coins we sell through a nationally recognized firm.

派生詞:authentication(n.證明，鑒定)

5.authoritative a.威臺勺，官方的(having or proceeding from authority);專斷白勺(dictatorial)

詞根記憶：來自authority(n.權(quán)威)

例:Authoritative parents are more likely than permissive parents to have children who as adolescents are self-confident, high in self-esteem, and responsibly independent.

派生詞:authoritatively(ad.權(quán)威地：命令式地)

6.authority n.權(quán)力(power);[pl.]當(dāng)局，權(quán)威（person or group having the power）

詞根記憶：author(權(quán)力)+ity--權(quán)力

例:The best strategy for managing a business, or any enterprise, is to give them as much authority as possible.

同根詞：authoritarian(a．獨裁的)；authoritative(a．有權(quán)威的，命令的)

7.authorize v.授權(quán)（to grant authority or power to）；批準(zhǔn)，認(rèn)可（to ratify）

詞根記憶：author(權(quán)力)+ize--把權(quán)力下放--授權(quán);批準(zhǔn)

例:authorize a loan批準(zhǔn)貸款

派生詞:authorized(a．經(jīng)授權(quán)的)

8.autobiography n.自傳(story of a person's life written by that person)

詞根記憶：auto(自己)+bio(生命)+graphy(寫)--寫自己的一生--自傳

例:Current feminist theory, has encouraged scholars of women's history to view the use of women's oral narratives as the methodology, next to the use of women's written autobiography.

9.automate v.（使）自動化(to convert to largely automatic operation)

詞根記憶：auto(自己)+mat(動)+e--自己動--自動化

例:Many corporations that have failed to automate have seen their profits decline.

派生詞:automatic(a．自動的；機械的)；automation(n．自動化)

10.automatic a.自動宜勺(having a self-acting or self-regulating mechanism);無意識的(largely or wholly involuntary)

詞根記憶：auto(自己)+mat(動)+ic（…的）--自動的

例:Airline executives are convinced that, just as one-third of bank customers still prefer human tellers to automatic teller machines, many travelers will still use travel agents.

派生詞:automatically(ad.自動地：機械地)

同根詞：autonomy(n.自治；自治權(quán))