cycles

• The oxygen cycle involves both oxidation and reduction .
  氧的循环包含氧化和还原。
• An inner bridge b of a cycle c in g is transferable .
  G中圈C的内桥B称为可移动的。
• The components of a potassium cycle vary greatly .
  钾素循环的各个环节有很大的变化。
• Any good man will try to break the cycle .
  凡有志气的人都应当起来打破这个循环轨迹。
• Cycling in the fast traffic lane is really dangerous .
  在快车道上骑自行车，可真悬。
• You 've got to be especially careful when you cycle on snow .
  雪地上骑车要格外小心。
• The life cycle of the tapeworm can proceed no further .
  绦虫的生活史无法进一步完成。
• Frequency is measured in hertz, or cycles per second .
  频率用赫兹即每秒钟的周数来计算。
• This plant effloresces only once during its life cycle .
  这植物在其生活史中只开花一次。
• An edge is a bridge if it is not contained in a cycle .
  一条边是桥当且仅当它不包含在圈中。