The research group of Associate Professor Gao Zhen of the Department of Electronic and Electrical Engineering of Southern University of Science and Technology has made important progress in the field of three-dimensional acoustic topological insulators, and the relevant results have been published in the international physics journal Physical Review Letters and selected as an Editors’Suggestion——《Observation of Dirac Hierarchy in Three-Dimensional Acoustic Topological Insulators》：https://newshub.sustech.edu.cn/html/202209/42761.html