Let's mark off the centre axis with a dashed line: this represents your normal state, not happy not sad, just neutral.

这代表你正常的状态，不喜不悲，只是中立。

With this animation, I showed that the feeling of happiness is actually the gap between your expectations, the dashed line, and your current reality, the dot.

通过这个动画，我展示了幸福的感觉实际上是你的期望（虚线）和你当前的现实（圆点）之间的差距。