It usually takes more than three weeks to prepare a good impromptu speech.
?? 名句詞匯解析
從本句名言中提取的重要詞匯，幫助你深度理解這句話
adv. 通常，經常，平常，慣常地;一直，向來;動不動，一般;素;
?? usual通常的+ly副詞后綴→通常地，慣常地
"The discovery of distillation is usually accredited to the Arabs of the 11th century."
通常認為，蒸餾法是阿拉伯人在11世紀發明的。
近義：invariably, mostly, normally, oft, often, oftentimes
反義：infrequently, occasionally, seldom, sometimes
vt. 準備;預備（飯菜）;配備;使（自己）有準備;
vt.& vi. 籌備，進行各項準備工作;做好思想準備;作出，制訂;鍛煉（身體等），訓練;
?? pre預先+pare準備→預先準備好
"He had failed to prepare adequately for the task before him."
他沒有為面臨的任務做充分的準備.
近義：apparel, ready, rig, saddle, capacitate, adapt
反義：impair, jumble, mess, muss, overset, overturn
adj. 即席的;臨時的;無準備的;
adv. 即席地;臨時地;無準備地;
n. 即興曲;即席演出;即席之作;即席演說;
"The announcement was made in an impromptu press conference at the airport."
這一宣布是在機場舉行的臨時新聞發布會上作出的.
近義：unseasonable, untimely, intempestive, extemporaneous, extemporary, improvised
n. 演說，演講，發言;說話，談話，說話能力或方式;（樂器的）音，音色;方言，民族語言;
"He finished his speech amid tremendous applause."
他在雷鳴般的掌聲中結束了演講。
近義：lecture, locution, monologue, peroration, phrase, prelection