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	trade schools trade secret trade show trade surplus trade test trade union trade unionism trade unionist trade up trade warranty trade waste trade wind trade-in trade-last trade-off trade-offs tradeable tradecraft tradecrafts traded traded (for) traded (in) traded down traded for traded in

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