pure line breeding

例句：

1. 1. Pure line breedingis 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.The breeder carefully selects the bestindividuals from pure line breeding to produce thedesired traits.
   育种者从纯种育种中精心挑选出最佳个体，以产生所需的特性。
3. 3. Pure line breeding has beenused to develop new strains of plants withimproved disease resistance.
   纯种育种已被用于开发具有增强病害抵抗力的新植物品种。