Excuse me, which is better for employment, the research on nano-materials or the research on metal anti-corrosion materials? I was admitted to Central South University as a graduate student this year, and now I am faced with the problem of choosing a tutor. I have three cooperation projects with Professor Dai Tagen, Dean of the School of Geology of Central South University, so I am sensitive to the frontier. I hope my advice to you is valuable. Nanotechnology is at the forefront, but it is not fun or direct. China is not at the forefront. I surpass Spain's active lightning protection technology in nanotechnology, but it takes 200 thousand to identify it. If you learn nanotechnology, it means that you have mastered anti-corrosion technology, because those who have not mastered nanotechnology anti-corrosion technology are still amateurs or painters. Therefore, we should learn nanotechnology as soon as possible to solve the technical problems of anti-corrosion. My cooperative research with Central South University will start in late March, and I hope to have the opportunity to meet and exchange. Yanyun Liu