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	radiigeras radio radio altimeter radio astronomer radio astronomical radio astronomy radio balloon radio beacon radio beam radio bearing radio car radio collar radio compass radio control radio direction finder radio electrician radio engineering radio field intensity radio field strength radio fix radio frequency radio galaxy radio link radio marker radio meteor

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