单词	subproblem
释义	subproblem noun sub·​prob·​lem ˈsəb-ˌprä-bləm  : a problem that is contingent on or forms a part of another more inclusive problem Word History First Known Use circa 1645, in the meaning defined above
随便看	headrace headraces headrail headrails headreach headreached headreaches headreaching headrest headrests headrig headright headring headrings headroom headrooms headrope headropes heads heads are going to roll heads off heads or tails heads will roll heads-up heads-up display

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