pure variety breeding

例句：

1. 1. Pure variety breeding is essential for the survival of many species.
   纯种育种对于许多物种的生存至关重要。
2. 2.In pure variety breeding, we are able to select traits that are beneficial for the plant's growth and development.
   在纯种育种中，我们能够选择对植物生长和发育有益的特性。
3. 3. The breeders carefully select parents from different pure variety breeding lines to ensure the quality of the offspring.
   育种者从不同纯种育种线中精心挑选父母，以确保后代的品质。