4D is the meaning of the three dimensions, this 4D refers to the development of technology in three dimensions of innovation. The number of rows is multi-dimensional, the traditional HIFU shot once only can get 1 line, so it will be a little touble some to do body weight loss. But 4D HIFU can be freely adjusted from 1-12 lines. Adjustable parameters are multidimensional: the distance between points and points, the distance between rows and rows. The energy of each point. The length of each line. These can be adjusted. Treatment is more precise and free.