Second, three of the four goals Spain scored in the knockout stages came after they had made a substitution, and shifted their system slightly.
第二，西班牙淘汰赛阶段4个进球中的3个是通过调整后打进的。
Objective: To establish a highly efficient production system of chimeras by perfecting and normalizing the key steps of technology system of gene knockout mice.
目的：完善和规范基因剔除小鼠技术体系的关键技术环节，建立一套高效的嵌合体制备体系。
The technology system of gene knockout mice is a most urgently needed technique in the life science research, especially in human genomic project and medical animal models research.
基因剔除小鼠的技术体系是生命科学研究，尤其是人类基因组计划和医学实验动物模型等领域所急需的关健技术。
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