n. 
核,病毒核心
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breakup,
break-up,
breakwater,
breakwater-glacis,
breakweather,
breakwind,
bream,
breast,
breast cancer,
breast drill,
相似单词
nucleogenisis,
nucleoglucoprotein,
nucleogony,
nucleohistone,
nucleohyaloplasm,
nucleoid,
nucleokeratin,
nucleolar,
nucleolate,
nucleolated,