单词	rat-a-tat
释义	rat-a-tat noun ˈra-tə-ˌtat  variants or rat-a-tat-tat ˌra-tə-ˌta(t)-ˈtat  : a rapid succession of knocking, tapping, or cracking sounds Word History Etymology imitative First Known Use 1681, in the meaning defined above
随便看	podicipidae podicipitiformeses podicipitiformesses podilegous podilymbi podilymbuses podilymbusses podite podites poditic podium podiums podler podlers podles podley podleys podlies podlike podo podobranch podobranchia podobranchiae podobranchs podocarp

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