单词	um and ah
释义	um and ahˌum and ˈah verb [intransitive] informal to think for some time before making a decision:  He ummed and ahed a bit but eventually agreed to help us.
随便看	rats rats' tails rattan Rattigan, Sir Terence rattle rattler Rattle, Sir Simon rattlesnake rattletrap rattling ratty raucous raucously raunchy Rauschenberg, Robert ravage ravages rave Ravel, Maurice raven ravening ravenous ravenously raver ravine

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