v. 擦掉( erase的第三人称单数 ); 抹去; 清除

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

v remove from memory or existence

v remove by or as if by rubbing or erasing

v wipe out digitally or magnetically recorded information