n.纪元，年代；历史时期，时代；重大事件； 变形： 复数：eras 双语释义：n.(名词)[C]纪元 a set of years which is counted from a particular point in time[C]历史时期,时代 period in history marked by an important event or development英英释义： era[ 'iərə, 'εərə ]n.a period marked by distinctive character o