Happiness is rarely absent; it is we that know not of its presence.
我不是赢家,我是输家。
Natural experiments can provide valuable insights into economic questions.
眼睛同时看两样东西,就会看不明白;耳朵同时听两种声音,就会听不清楚。
耳朵是负责听的,听了之后再加以审察,这叫做聪明。