Pre-preparation, background, these are at the forefront, not too much, not too much repetition. The key point is to introduce the function of the product, which is also the core competitive part. It is suggested that this part be divided into several pages, not crowded together, and the key points must be highlighted.

At the end of the last part, we should make a perfect plan. In addition, my reading style is very dark, which is the usual eye protection mode. My senses will be much better, making people subconsciously relaxed and easy to bring in your explanation.