breeding flock

例句：

1. 1.The breeder is responsible for selecting the best animals to produce offspring.
   育种者负责选择最好的动物来繁殖后代。
2. 2. The farmer has a large breeding flock of sheep.
   这位农民拥有一大群羊。
3. 3.The scientist studied the genetics of the breeding flock.
   这位科学家研究了育种群的遗传学。