Warm Summer of Wooden Fish

I have always thought that X+Y must be equal to XY, which is wrong. It turns out that only when X and Y are moving in the same direction and embracing each other, X*Y is equal to XY, just like the stable CCl4 is no longer stable and volatilizes when heated. If you understand this truth too late, you will eventually miss it... The sad literature of my childhood was always scorned. It is ridiculous to think about it, but it is a pity and a pity... Intention: Ignorant friendship is ultimately perfect