过去是一个跟随我们的影子，但选择让它定义我们还是走向光明，是我们的选择。
The past is a shadow that follows us, but it is our choice whether to let it define us or to step into the light.
The privilege of a lifetime is being who you are.
你必须花费一些精力和努力才能看到数学的美。