One quantity decreases with the increase of another quantity or one quantity increases with the decrease of another quantity, and their products are the same, then these two quantities are inversely proportional.
The answer is mouse, and the magic of mouse personality is universally loved and understood like Mickey Mouse in Walter Disney's works. On the surface, people who belong to rats may be taciturn, but they are not. Your heart will never be as calm as you appear. In fact, mice are easily excited, but you can control yourself. This is the reason why mice are popular, and it is also the best explanation for many friends. Rat people may be honest, but your friendly actions often make others feel stiff. Rats are usually cheerful, happy and sociable. Occasionally, you may meet a rat who loves to criticize, complain and find fault.