But then he created a second group of the individually most productive chickens -- you could call them superchickens -- and he put them together in a superflock, and each generation, he selected only the most productive for breeding.
然后他又用生产力最强的鸡 创建了第二个鸡群—— 你可以叫它们 “超级鸡”—— 他将超级鸡放在一起 成了”超级鸡群“， 然后在每一代里， 他都选择最高产的鸡来繁衍。