On the evening of July 11, 2020, the public welfare lecture on child safety and first-aid knowledge hosted by Zenkers group was held as scheduled. Three professional instructors taught parents and children about emergency rescue through slides and practical exercises. The instructor taught first-aid knowledge such as bandaging and hemostasis, mouth-to-mouth breathing, heart compressions, and Heimlich. Learn a lot from the exercises, if necessary, which can save lives!