procession          
noun uk/prəˈseʃ.ən/ us/prəˈseʃ.ən/
C2 [ C ]行列,队伍 
a line of people who are all walking or travelling in the same direction, especially in a formal way as part of a religious ceremony or public celebration
  a wedding/funeral procession 婚礼/葬礼的行列 
 The festival will open with a procession led by the mayor. 艺术节将由市长带领的一支队伍揭开序幕。 
  [ S ]一系列,一长串 
a series of people or things, one after the other
  My day has just been a never-ending procession of visitors. 我今天一整天来访的客人络绎不绝。 
 - More examples
 - The dancers leading the procession were in colourful and elaborate costumes.
 - He craned forward to see the procession.
 - Huge crowds followed the funeral procession in a public demonstration of grief.
 - The Queen's carriage headed the procession.
 - Thousands of people lined the streets to watch the presidential procession pass by.