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十五世纪初，为了寻找失踪的前朝皇帝，永乐大帝开启了远洋海外的超级工程。郑和，率领巨型船队，征服巨浪和凶险，联系了中国与世界。帝国财政无法承受下西洋的巨额成本，缺乏商业驱动的航海事业注定难以持久。七下西洋的结束，是郑和人生的终点。明王朝在大航海时代来临前夕，降下最后的船帆。。The HISTORY Channel's innovative series "The Mega-Brands That Built America" returns for its third season on Sunday, June 1 at 9pm ET/PT. Executive produced by and featuring NFL legend Peyton Manning, the series highlights the origin stories of some of the most successful businesses and business titans in history. Each one-hour episode is jampacked with nostalgic products, surp...。