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当一个人在寻找他需要的东西时，却在他回家的时候发现了它。"Shanghai cannot make everything, nor can it eat all the industrial chains from top to bottom." In April this year, Li Qiang stressed at the city's "Four Major Brands" promotion conference that in order to develop Shanghai's manufacturing industry, it is necessary to identify the high end of the industrial chain and value chain, aim at the most cutting-edge and cutting-edge disruptive technologies, aim at the core links that have control over the industry, and aim at those "source innovations" that drive a wide range of industries. "Not every link should be there, but the core link that has control over the entire industry should be in hand."An event can have many listeners attached to it. These listeners tell the system to call my XXX method when the event occurs by registering their own event handling routines.Console.log ("I finally saw Baidu's pen test questions");