Natural experiments can provide valuable insights into economic questions.
自然实验可以为经济问题提供有价值的见解。
"The scars of your love remind me of us."
If it doesn't challenge you, it won't change you.
The only way to deal with life is to accept it as it is.
译文：在集市中是没有老虎的，这是人们都明了的，可是经过多个人的谣传，就像真的有老虎一样。