nucleus

noun

1. the central structure of the lens that is surrounded by the cortex

Synonym: lens nucleus

2. a part of the cell containing DNA and RNA and responsible for growth and reproduction

Synonym: cell nucleuskaryon

3. any histologically identifiable mass of neural cell bodies in the brain or spinal cord

4. a small group of indispensable persons or things

e.g. five periodicals make up the core of their publishing program

Synonym: corecore group

5. the positively charged dense center of an atom

6. (astronomy) the center of the head of a comet
consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail

1. (原子)核
The nucleus of an atom or cell is the central part of it.

e.g. Neutrons and protons are bound together in the nucleus of an atom.
在原子核里，中子和质子是结合在一起的。

2. (组织的)核心，中心
The nucleus of a group of people or things is the small number of members which form the most important part of the group.

e.g. The Civic Movement could be the nucleus of a centrist party of the future.
公民运动的成员可能会成为未来中间派政党的核心。

1.

1. 神经核：在白质中还存在一些灰质,由功能相同的神经细胞胞体集合而成,称为神经核(nucleus). 大脑两半球内部存在各种的神经纤维,以便大脑两半球各部位间进行联系(如大脑回与回之间,叶与叶之间的联系纤维)、两个半球之间进行联系(如胼胝体纤维),

2. 原子核：原子核(nucleus)也简称「核」,指原子中心的稠密部分,由数目接近的质子与中子结合而成. 核子(nucleon)则是指组成原子核的粒子,亦即质子与中子的统称. 因此「核」与「核子」虽然只差一个字,两者意义却天差地远. 然而考虑到中文的习惯,