比如绕环投球法，球场变小，联盟扩大，规范了好球区，重量训练的状态这些因素都使得每场比赛拿到了比以前更多的分。
Factors like the tighter wound ball, smaller ballparks, the expansion of the league, uniformed strike zones, and state of the art weight training all contributed to the rise in runs per game.
比如绕环投球法，球场变小，联盟扩大，规范了好球区，重量训练的状态这些因素都使得每场比赛拿到了比以前更多的分。
Factors like the tighter wound ball, smaller ballparks, the expansion of the league, uniformed strike zones, and state of the art weight training all contributed to the rise in runs per game.
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