eras的中文意思、音标与词形变化

n. 纪元, 时代；年代（era的复数形式）

n a period marked by distinctive character or reckoned from a fixed point or event n a major division of geological time; an era is usually divided into two or more periods n (baseball) a measure of a pitcher's effectiveness; calculated as the average number of earned runs allowed by the pitcher for every nine innings pitched