The relationship between cytoplasm and nucleus is the basic problem of biology, and nuclear transfer (nt) and pronuclear transplantation are the important methods to research their relations.
细胞核与细胞质的关系是生物学的基本问题，核移植和原核置换是研究核质关系的重要方法。
SAT problem is the first NP-complete problem and the nucleus of the category of NP-complete problems.
SAT问题是第一个NP-完全问题，并且是一大类NP-完全问题的核心。
How to advance the nucleus operation by creating and keeping its advantage, which is the most important problem that Greating-Sinotrans Group Limited needs to solve.
如何创造、保持竞争优势来提高企业核心竞争力，是外运裕利集团首要解决的问题。
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