来自《耶鲁大学开放课程：新生有机化学 第4集 第4集》

• 
  
  Another possibility?
  还有其他的吗
• 
  
  Sophie?
  索菲
• 
  
  Half a head instead of a full head.
  用半箭头替换全箭头
• 
  
  Ah, like a fishhook instead of the double arrow.
  啊 就像一个鱼钩那样
• 
  
  And that's in fact what's used.
  而那正是被使用的
• 
  
  If you want to shift just one electron you show a single barb,
  如果你移一个电子就一个钩
• 
  
  and if you do a pair of electrons you show a double barb,
  如果一对电子就一对钩
• 
  
  a curved arrow.
  一个弯箭头
• 
  
  So curved arrows don't show atoms moving.
  弯箭头并不代表原子移动
• 
  
  They don't show this atom goes to there.
  不是说这个原子跑到那儿了
• 
  
  They show an electron pair moving,
  而是一个电子对在运动
• 
  
  or sometimes a single electron moving,
  或者有时候一个单电子的移动