What is a dangerous source?

Hazard source refers to the source, state or behavior that may lead to personal injury and/or health damage and/or property loss or their combination. Among them, root refers to a physical entity with energy or generating and releasing energy. Such as lifting equipment, electrical equipment, pressure vessels, etc. Behavior refers to the decision-making behavior, management behavior and business behavior of decision makers, managers and employees. State refers to the state of things and the state of the environment.