cross-breeding

例句：

1. 1. The breeder is trying to develop a new strain of dog that can withstand the cold weather.
   育种者正在尝试培育一种能抵抗寒冷天气的新品种狗。
2. 2. In cross-breeding, scientists combine different species to create new and unique traits.
   在杂交育种中，科学家将不同物种结合在一起，以创造新的和独特的特征。
3. 3.The farmer cross-bred his cows with those from other regions to improve their milk production.
   这位农民将他牛群中的母牛与其他地区的公牛交配，以提高它们的产奶量。