假设IVF这门科学还处在相对幼稚的时期，第二代不育的问题是一个非常让人感兴趣的领域，涉及的问题可能只有在未来几年才会清楚。
This question of second-generation infertility is an area of particular interest, and given the relative infancy of the science of IVF, it is something that will become clear only in years to come.
阴性选择是幼稚T细胞在分化发育过程中一个非常重要的步骤。
Negtive selection plays a very important role in maturate of T cell.
这一系列的书在介绍日常生活的一些人，事，物， 每一个主题都相当的生活化， 非常适合幼稚园大班或是小学低年级的儿童阅读。
WELCOME BOOKS provide children with a fun and exciting introduction to reading about the people , places, and things in their world.
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