| 单词 | sei (whale) | 
| 释义 | sei (whale) in American English (seɪ)  noun   a rorqual (Balaenoptera borealis) with a light-gray or bluish back, found in all seas  Word origin Norw seihval < sei, coalfish + hval, whale: from its arrival at fishing grounds with the coalfish | 
	
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