责任失分 meaning in English

earned run

He won the pitching triple crown with a 23 - 4 record , a 2 . 07 era that is especially impressive when the league era was 4 . 86 , and 313 strikeouts in 213 1 / 3 innings , a rate of 13 . 2 per nine innings , the best in history at the time
他凭借着23胜4负的胜率，在联盟平均4 . 86责任失分率的情况下取得的令人印象深刻的2 . 07的责任失分率，以及在当时史上最好的在213又三分之一局里的313次三振? ?每九局13 . 2次，赢得了当年的投手三冠王。