esprit de corps       
noun [ U ]  formal uk/esˌpriː də ˈkɔːr/ us/esˌpriː də ˈkɔːr/
 团队精神,集体精神;集体荣誉感
the feelings, such as being proud and loyal, shared by members of a group of people
  His leadership kept the team's esprit de corps intact during difficult periods. 他的领导使得这个团队在困难时期仍保持团队精神。 
 Compare: morale