In fact, the recordings were mostly unrehearsed improvisations.事实上，这些唱片收录的大部分乐曲都是没排练过的即兴之作。His performance featured several clever improvisations.他的表演特色就是几次巧妙的即兴发挥。The recordings were mostly unrehearsed improvisations.这些唱片收录的大部分乐曲都是没排练过的即兴之作。His new album is full of improvisations.他的新专辑里有许多即兴作品。