nu·cle·us/`njuklɪəs; ˈnjuːkliəs/ n [C] plural nuclei /-klɪˏaɪ; -kliaɪ/ 1 the central part of an atom 原子核 2 the nucleus of sth the most important part of something 某物的核心: Photographs by Weston form the nucleus of the collection. 韦斯顿的摄影作品成为收藏品中最重要的部分。 3 the central part of a cell 细胞核