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	sill course sill floor sill man Silla sillabub sillabubs silladars sillagi Sillaginidae sillaginidaes sillaginoid Sillago sillagoes sillagos sillar sillares sillenite siller sillers sillibub sillibubs sillier sillies silliest sillily

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