Engineering is a design plus paper, which requires design ideas and data realized in design simulation. This is complicated!
Design is not for you to design an object, but for you to simulate it or make 3D design drawings and so on. C language, UG, PRO/E, CAM, CAXA, SWOLIDWORD"+CAD are all used to write programs or make design drawings. For example, make a website similar to the paper 168, and so on. For example: www.lw168.com.