这些知识，关键时刻能救命！

Group 1 - The article emphasizes the importance of first aid knowledge, especially on World First Aid Day, highlighting that injuries in daily life are unavoidable and can lead to serious consequences if not treated properly [1][2][3]. Group 2 - For burns, the correct procedure includes removing the source of heat, rinsing the wound with running water for 20-30 minutes, and covering blisters with sterile gauze without popping them [5]. - In case of cuts, applying pressure for 5-10 minutes can effectively stop bleeding, and deeper cuts may require professional medical attention [7]. - For sprains, rest and cold compresses are recommended, while severe swelling and bruising may indicate ligament tears, necessitating medical evaluation [9]. Group 3 - For nosebleeds, methods include pressure on the nose, nasal packing with clean materials, and cold compresses on the nasal root [12][13]. - If an object is lodged in the throat, immediate medical attention is advised, while self-administered abdominal thrusts or the Heimlich maneuver can be used for airway obstruction [17][18].