impromptu

即兴曲；即席演出中释n

即席地中释adv

即席的英释中释adjdone or said without any preparation or planning

1 When do we make impromptu speeches?.我们什么时候要做即席演讲？

2 When Marco was asked to give an impromptu speech on“Addictions,”he divided the topic /into/ several parts. Notice how he used the pattern of related subtopics in the outline that follows..举个例子，马可要做一个关于“嗜好”的即席演讲，他将这个主题分成了几部分，注意下面他在大纲中是如何运用有关联副主题模式的。