1.assign v.(to)指派(to appoint as a task);分配；归于(to ascribe)

词根记忆：as+sign(签名，做记号)--记下某人做某事--指派

例:The most effective way for managers to assign work is to divide complex tasks into their simpler component parts. ll the role assigned by society//Under Mr. Harel's system, each business must assigna value to each job.

派生词:assignment(n.任务;分配)

2.assist n.帮助(an act of assistance);v.参加，出席(to be present as a spectator);帮助，促进(to give support or aid)

联想记忆：as+sist(站立)--站在你这边--帮助

例:They were rarely allowed to assist master tailors in the production of men's clothing.

派生词:assistance(n.援助，帮助)

3.associate a.联合的(joined)；n.台伙人(partner; colleague);v.将人或事物联系起来(to join people or things together)

联想记忆：as（加强）+soci（看作social社会的，交际的）+ate(做)--进行社交（的人）--合伙人

例:Most customers associate shopping carts with low-quality discount stores.

派生词:association(n.协会，联盟；联合)

同根词：dissociate(v.分离：使分裂)

4.association n.协会，联盟（an organuization persons having a common interest);联想（something linked in memory or imagination wrth a thing or person)

词根记忆：来自associate(v.结交；联合)

例:They made a transition from old patterns of an association to new ones.

派生词:associational(a.联想的：协会的)

同根词：dissociation(n.分解;分离)

5.assume v.假定，假设(to suppose);担任…的职位(to undertake the duties of)

词根记忆：as+sume(拿，取)--担任

例:It is widely assumed that a museum is helped financially when a generous patron donates a potential exhibit.

派生词:assumption(n.假定，假设)

6.assumptiori n.假定，设想(an assuming that something is true)；担任(a taking to or upon oneself)

词根记忆：来自assume(v.假定，设想)

例:This claim contradicts the basic assumption of organization theory.

同根词：presume(v.假定)

7.asteroid n.小行星(a small planet)

词根记忆：aster(星星)+oid(像…一样)--小行星

例:Scientists calculated that the asteroid, traveling at 46,000 miles an hour, is on an elliptical path.

派生词:asteroidal(a.星状的)

8.asthma n.哮喘( chronic chest illness causing difficulty in breathing )

例:Asthma, a bronchial condition, is a much less common aliment than hay fever.

9.astronomical a.庞大的(enormously or inconceivably large or great);天文学的(of astronomy)

词根记忆：astro(星星)+nomical--星星的，星体的--天文学的

例:It seems likely that a number of astronomical phenomena, such as the formation of planetary nebulas, may be caused by the interaction where two stars orbit each other at close range.

同根词：astronaut(n.宇航员)

10.astronomy n.天文学(scientific study of the sun, moon, stars, planets, etc.)

词根记忆：astro(星，天体)+nomy(学科)--天文学

派生词:astronomical(a.天文学的)

同根词：astronaut(n.宇航员)；astrophysics(n.天体物理学)