improvising []

以下由轻松背单词网站提供

附加级

即兴创作（improvise的现在分词形式）

I knew he was improvising, an old habit of his. 我知道他是在即兴发挥，这是他的老习惯。
A few lecturers have been improvising to catch up. 部分讲师被临时抽调以救急。