v.即兴创作；即兴表演；临时准备
It is much easier to improvise a song than it is to improvise a symphony. 即兴创作一支歌曲比即兴创作一部交响曲要简单得多。
adj.即席而作的；临时的
动词improvise的过去式和过去分词.
n.即兴诗人；即席演奏者
