Earthquakes are one of the most difficult natural phenomena to predict. Even with the most advanced warning system, people usually only have a few seconds to escape. Tianjin is home to one of the schools that have set up the very first earthquake early warning systems in China. From evacuation and shelter to first aid, earthquake drills have become regular practice for students. So, how does the early warning system work? What should you do during an earthquake? CGTN brings you more.