But the other four balls are made of glass.

但是其他四个球都是用玻璃制成的。

Usually it's three or four balls, or it could be something else more dangerous.

通常是三个或四个球，或者可能是其他更危险的东西。

Once an umpire calls four balls, then the batter goes to first base.

一旦一个裁判调用四个球， 那么击球手就要去打一垒。

Everyone follows Quidditch - played up in the air on broomsticks and there's four balls — sorta hard ter explain the rules.”

人人都喜欢玩魁地奇— 骑飞天扫帚在空中打，有四个球— 至于玩球的规则嘛，解释起来还真有点儿困难。”

And he was off, explaining all about the four balls and the positions of the seven players, describing famous games he'd been to with his brothers and the broomstick he'd like to get if he had the money.

接着他就滔滔不绝地讲解四只球，七名队员的位置，绘声绘色地讲他跟几个哥哥去看的几场有名的球赛，并说等他有了钱，他要买一把他喜欢的飞天扫帚。