cycles

例句:

• What have we learned from the cycles of time?
  来自SA
• The two discs also contain two of Britten's lesser-known song-cycles.
  这两张唱片还包含了布里顿两首不甚知名的声乐套曲。
  
• The company manufactures a range of innovative light-weight cycles.
  这家公司生产一系列的新型轻便自行车。
  
• Lemming populations also undergo periodic boom and bust cycles.
  来自BBC
• We must avoid the damaging boom-bust cycles which characterised the 1980s.
  我们必须避免出现20世纪80年代那样具有破坏性的繁荣萧条交替循环的局面。
  
• These are the cycles that I'm talking about.
  来自SA