Today, we learned something about bile. Among them, positive proportion and negative proportion left a deep impression on me. Proportion is two related quantities, one of which changes and the other changes. One quantity increases with the increase of the other. If the ratio (that is, quotient) of the two numbers corresponding to these two quantities is certain, these two quantities are called proportional quantities, and the relationship between them is called proportional relationship, so we call these two variables proportional. Inverse ratio is opposite to direct ratio. I feel that this part of knowledge is somewhat difficult, but I am firmly grasped and I am very happy.

Hope to adopt.