立即,当即,事先没有准备地;
临时的;非正式的;随便的;无礼的
同义词:ad-libextemporaneousextemporaryextemporeimpromptuoffhandoffhandedoff-the-cuffunrehearsed
同义词:offhandoffhanded
"I don't know the figures off-hand"
同义词:ex tempore
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