本书内容包括：早期探险、郑和下西洋、葡萄牙人的发现、哥伦布发现"新大陆"、麦哲伦环球航行灯。( The contents of this book include: early exploration, Zheng He's travelling to the west, the discovery of the Portuguese, the "New World" discovered in Columbus and Magellan global navigation lights.)
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