with little or no preparation or forethought; "his ad-lib comments showed poor judgment"; "an extemporaneous piano recital"; "an extemporary lecture"; "an extempore skit"; "an impromptu speech"; "offhand excuses"; "trying to sound offhanded and reassuring"; "an off-the-cuff toast"; "a few unrehearsed comments" 同义词:ad-lib, extemporaneous, extemporary, impromptu, offhand, offhanded, off-the-cuff, unrehearsed
"Extempore" (alternate title "The Beach Where Time Began") is a science fiction short story written by Damon Knight. It first appeared in the August 1956 issue of Infinity Science Fiction and has been reprinted twice, in Far Out (1961) and The Best of Damon Knight (1976).