nucleus

核心, 核子, 原子核, 起点

a part of the cell containing DNA and RNA and responsible for growth and reproduction; the positively charged dense center of an atom; (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; any histologically identifiable mass of neural cell bodies in the brain or spinal cord