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	rubs elbows rubs elbows (with) rubs elbows with rubs in rubs off rubs out rubs the wrong way rubs up rubstone rubstones rubus rubuses rubusses ruby ruby blende ruby copper ruby copper ore ruby fly ruby glass ruby grass ruby laser ruby port ruby silver ruby silver ore ruby spaniel

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