If a foreigner asks China what Yin, Yang, Eight Diagrams and Five Elements mean! How to explain in simple sentences!

You can say this: This is a set of prediction and inference methods obtained by China ancients according to the natural evolution law of everything in the world. It reflects a circular process of mutual development and mutual restriction, and judges whether the position of things in this development process conforms to the laws of nature, which is auspicious and fierce. Yin and yang, gossip and five elements are the embodiment of this law.