I brought you a brochure of works that has been sorted out recently. I bought a real object and disassembled it myself. I took the vernier caliper to measure it bit by bit and drew it in the software. then I found out the information bit by bit and finally sorted it out. through this exercise, I also understood that product design is not only necessary to master the skills of making appearance, but also necessary to understand engineering, in this way, the entire workflow will not be like a headless fly repeatedly because of dismissal issues to change the draft. The final brochure is a bit long and wordy. Please take your time and share your experiences. (Some materials come from the Internet, invasion and deletion)