Cryopreservation protocol 基本例句 冷冻方法 During earlier time the study mainly focused on screening and optimizing the cryprotective mediums and freezing methods, which exploited the technique of cryopreservation deeply.早期的研究多集中在对冷冻保护剂和冷冻方法的筛选与优化上,为猪精液冷冻保存进行了深入的探索。