英语翻译李开复自传里一个哥伦比亚大学哲学系老师说得一句话"想象有两个世界,一个世界中有你,一个世界中没有你,让两者的不同

in Kai-fu lee's autobiography a Columbia University philosophy teacher say a words "imagine there are two world, a world have you, a world without you, let the difference is the largest, maximize your influence, this is the meaning of your life."