| [/ˈnjuːklɪəs; US ˈnuː-; ˋnuklɪəs/] n (pl nuclei /-klIaI; -klI9aI/) 用法:
1 central part, around which other parts are grouped or collected 中心; 核心:
The fortress was the nucleus of the ancient city. 这城堡是这座古城的中心. *
These paintings will form the nucleus of a new collection, ie Others will be added to them. 这些画将构成新的收藏品的主要部分（还将增加其他收藏品）. 用法:
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(a) (physics物) central part of an atom, consisting of protons and neutrons 核, 原子核（包括质子和中子）.
(b) (biology 生) central part of a living cell 细胞核. |