heredity improvement

• 遗传改良

heredity improvement的用法和样例：

例句

1. Research status and some consideration in genetic improvement of elm species.
   榆属树种遗传改良研究现状及思考。
2. Advances in Genetic Improvement of Spruce in Abroad and Breeding Strategies of Picea asperata Mast.
   国外云杉遗传改良现状和粗枝云杉育种策略。