Suppose you have 100 people on earth who know you, then you have 102 versions of you, the true you, the you as you know now, and the 100 different you as known by others. By putting time axis into the equation, you shall know who you are, where you are and when you are.

假如地球上只有100人认识你，那么总计有 102 个你：真你、你此刻认识到的你、以及剩下的 100 个他人所认识的你。把时间加进来看，你现在应该已知道你是谁、在哪里以及活到了哪。