Zhao Tingyang is a big thinker who came up with a really interesting idea called Tianxia. Tianxia is a Chinese word that means "all under heaven" and it's kind of like a big family of everyone in the world.
Zhao Tingyang thinks that instead of just caring about our own country and people, we should think about everyone in the world and try to make things fair for everyone. He says that in Tianxia, everyone would be like brothers and sisters and they would work together to take care of the world and make things better for everyone.
Some people might not like this idea because they think it's better to focus on their own country and people first, but Zhao Tingyang thinks that if we all work together as one big family, we can do more and make the world a better place.