n.[C]

1. 【核】（原子）核
2. 【生】细胞核
   It is possible to transplant chromosomes in cell nuclei.

   移植细胞核内的染色体是可能的。

3. 核，核心，中心；起点
   These councils would form the nucleus of a future regime.

   这些委员会将成为一个未来政权的核心。

4. 【天】（彗）核
5. 【化】环，（晶）核

n.

1. the central and most important part of an object or group.
2. Physics  the positively charged central core of an atom, containing nearly all its mass.
3. Biology  a structure present in most cells, containing the genetic material.
4. a discrete mass of grey matter in the central nervous system.