1.automation n．自动装置(mechanism thatimitates actions of humans)
例:Many workers who lose their jobs to automationwill need government assistance to survive.
2.automobile n．汽车(a usually four-wheeledaLrtomotive vehicle)
例:The automobile industry dominated the American economy in the 1920s.
3.autonomy n.自治(self-government with respect to local or internal affairs)；自主（权）(the right of self-government)
4.availability n.可用性（quality or state of being available)
例:The ample availability of land makes security of land tenure unimportant.
5.avalanch n.雪崩 (a large mass of snow, ice, earth, rock, or other material in swiftmotion down a mountainside or over a precipice );v.雪崩 ( to descend in an avalanche)
例:Over the same period, however, the number of visitors to ski resorts who were caught inavalanches decreased, even though there was no reduction in the annual number of avalanchesin the Sordellian Mountains.
6.aversion n．厌恶，反感( antipathy)
例:Their aversion to government paperwork made them reluctant to pursue manygovernment contracts.
7.avian n.鸟;a.鸟类的(of, relating to, or derived from birds)
例:These results confirmed that avian species can develop preferences for palatable foodthrough social leaming.
8.aviation n.航空（术）（the operation of heavier-than-air aircraft）；飞机制造业(airplanemanufacture)
例:Ardatilon fuel is projected to decline in price over the next several years.
9.avlator n.飞行家，飞行员(the pilot of an aircraft)
例:All trainees in a certain aviator training program must take both a written test and a flighttest.
例:The more rare something becomes, the more avidly it is sought by collectors.