adj.即席的；临时的；无准备的；adv.即席地；临时地；无准备地；n.即兴曲；即席演出；即席之作；即席演说 变形： 复数：impromptus 英英释义： impromptu[ im'prɔmptju: ]n.an extemporaneous speech or remark"a witty impromptu must not sound premeditated"a short musical passage that seems to have been made spontaneously w