1.“不错,先生,”拜伦说,“可是骡子不能传种接代。” "Yes, Sir," said Byron, "and mules are sterile." dict.yoduao.com
2.一项育种计划,必须为把新的遗传种质不断地渗进育种种群提供条件,以避免近交。 A breeding programme must provide for a continual infusion of new genetic material into the population to avoid in-breeding. dict.yoduao.com