one-shot
adjective /ˈwʌn ʃɒt/
  /ˈwʌn ʃɑːt/
(North American English) (British English one-off)
 [only before noun]- made or happening only once and not regularly一次性的;非经常性的 - It was supposed to be a one-shot deal but it was so successful the band signed up for a tour.这本来是一次交易,但非常成功,乐队报名参加了巡回演出。 
 
- It was supposed to be a one-shot deal but it was so successful the band signed up for a tour.