reason

• 失败的原因

  reason for a failure

• 成功的原因

  reason for a success

• 丰收的原因

  reason for a bumper harvest

• 由于某种原因

  for some reason or other

• 没有任何原因

  for no reason at all

• 原因何在？

  what's the reason?

• 分析生病的原因

  analyze the cause of the illness

• 是什么原因 赢得了这样大的胜利呢？

  how was such a major victory won?