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	roll sulfur roll the bones roll the dice roll top roll train roll up roll up one's sleeves roll welding roll with the punches roll-and-fillet molding roll-cumulus roll-forming machine roll-ins roll-leaf roll-neck roll-necked roll-off roll-on roll-over arm roll-over plow roll/trip off the tongue rollable Rolland rollaway rollaway bed

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