aeon (also eon)

n period of time so long that it cannot be measured 极长而无法计算的时期; 万古: The earth was formed aeons ago. 地球形成於亿万年前.

advertisement, advertiser, advertising, advertize, advice, advisability, advisable, advise, advise sb. to do sth., advised, advisedly, adviser, adviser (also esp US advisor), advisory, advocacy, advocate, advt, adze (US adz), Aegean, aegis, aerate, aeration, aerial, aerie, aero-, aerobatic, aerobatics, aerobics, aerodrome, aerodynamic, aerodynamics, aeronautics, aeroplane, aerosol, aerospace, aesthete, aesthetic, aesthetically, aesthetically (US also es-), aestheticism,