Hefei, December 25 (Reporter Wu Lan) “Because supercritical fluids only remain stable at high temperature and high pressure, how to accurately identify the activities of supercritical fluids in a certain area has always been a scientific problem to be solved. Professor Xiao Yilin of the University of Science and Technology of China said in an interview on the 25th that his team put forward four criteria for identifying supercritical fluids in the subduction zone after a large amount of data analysis.