adj.即席的；即興的，臨時(shí)的
adv.即興地，無(wú)準(zhǔn)備地
n.即興之作；即興曲
It usually take me more than three weeks to prepare a good impromptu speech. 為了準(zhǔn)備一則即席的好講辭，我通常要三個(gè)星期以上。
An impromptu visit broke up the long afternoon. 突然的造訪打破了漫長(zhǎng)的午后時(shí)光。
用作名詞 (n.)His call for a book of the trains had been a sheer piece of impromptu. 他打聽(tīng)火車時(shí)刻表只是一段純粹的即興曲。
