1. Briefly describe the function of invention patent. The simpler the better, don't say too much, and people don't understand;
2. Describe what people did when the invention was not patented;
3. Explain what substantive problems the invention patent has solved;
4. Explain how invention patents solve these problems. When it comes to complex theories, you can mention them in one sentence, not at length;
5. Focus on the characteristics and highlights of invention patents;
6. Describe the environmental problems such as the production, sale, use and profit of invention patents.