1.a period marked by distinctive character or reckoned from a fixed point or event
2.a major division of geological time; an era is usually divided into two or more periods
自責(zé)分(Earned Run,通常記為ER),在棒球比賽里指的是對(duì)方的得分當(dāng)中,因?yàn)橥妒值耐肚蛩斐傻牟糠荩ㄒ簿褪强鄢驗(yàn)槭д`或是捕逸所造成的失分) 投手自責(zé)分率(earned run average,通常記為ERA)又稱之為『防御率』(語源為日本漢字「防御率」),其計(jì)算門檻是投球局?jǐn)?shù)必須達(dá)到所屬球隊(duì)之出賽數(shù)的總和(但各聯(lián)盟可自行規(guī)定投球局?jǐn)?shù),如日本二軍以0.8局/場(chǎng)來計(jì)算規(guī)定局?jǐn)?shù))。從防御率可得知一個(gè)投手每九局大概會(huì)失幾分,其數(shù)值越