单词	direct sum
释义	direct sum noun : cartesian product compare direct product Word History First Known Use 1908, in the meaning defined above
随便看	proper adjective proper fraction proper motion proper noun proper nouns proper to properate properation properdin properdins properer properest properispome properispomena properispomenon properlier properliest properly properness propernesses propers propertied properties Propertius property

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