What oxygen is to the lungs, such is hope to the meaning of life. 希望对于生活的意义，就像氧气对肺那样那样的重要。
You are the only exception. 你是唯一的例外。
Happiness doesn't depend on any external conditions, it is governed by our mental attitude.幸福不是取决于外界环境，它由我们的心态来决定。
A day without sunshine is like night. 没有阳光的白日如同黑夜。
