What do you mean by exogenous factors in fortune telling?

You can't tell by looking at your face. It is only at a certain age that the child suddenly feels a little weak, just like the external feeling now. Only in this way can we prove that it is Tuo, and changing Tuo means changing life. It is not good to change tuo. One of my classmates changed it once. Today, I suddenly felt weak at my desk in class, and now I have to change it again.