哪有关于航海的英文资料可以免费下载的，就是比较专业的那种。是免费的噢！

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Christopher Columbus was a navigator and maritime explorer credited as the discoverer of the Americas.
Columbus' voyages across the Atlantic Ocean began a European effort at exploration and colonization of the Western Hemisphere. While history places great significance on his first voyage of 1492, he did not actually reach the mainland until his third voyage in 1498. Likewise, he was not the earliest European explorer to reach the Americas, as there are accounts of European transatlantic contact prior to 1492. Nevertheless, Columbus's voyage came at a critical time of growing national imperialism and economic competition between developing nation states seeking wealth from the establishment of trade routes and colonies. Therefore, the period before 1492 is known as Pre-Columbian.