几个世纪以来，探险家们冒着生命危险探索未知的世界，其原因在不同程度上与经济和民族主义有关。
For centuries, explorers have risked their lives venturing into the unknown for reasons that were to varying degrees economic and nationalistic.
当哥伦布、达·伽马和麦哲伦等著名的探险家们乘船离开欧洲时，他们并不是为了寻找一个新世界。
When famous explorers like Columbus and da Gama and Magellan left Europe in their ships, they weren't looking for a new world.
正是在这个背景下，出现了一个叫哥伦布的探险家，提出了环游世界探寻亚洲的计划。
It was upon this backdrop that an explorer, Christopher Columbus, submitted his plans for a voyage to Asia by sailing around the world.
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