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2. Different materials and processes:Memory startup!吴凌珑柔声道，长帆在家憋了这么多年，谁能对他有那么大信心？你就有。是我。Click OK.This is Pantanal, the largest tropical wetland in the world, and it is the home of thousands of animals. In this magical land, the pearl-like water and the swamp make waves and fog, just like a beautiful scenery of heaven on earth, but there are many hidden worries behind it. The fate of the animals living here is uncertain. Every year, the land here is sometimes submerged and sometimes plunged into drought. Even the most powerful animals cannot rest easy to survive in Pantanal. (Animal World 20190324 South American Wild World (III))When the incident occurs, the incident will begin to spread. Why should it be spread? Because the event source itself does not have the ability to handle the event. For example, when we click one, a click event will be generated, but the button itself cannot handle the event (nonsense). The event must be propagated from the button to reach the code that can handle the event (for example, we give the onclick attribute of the button the name of a function, that is, let the function handle the click event of the button).