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.
英国探险家阿拉斯泰尔·汉弗莱斯曾骑自行车环游世界，徒步穿越了印度，还从非洲划船到南美洲。
British adventurer Alastair Humphreys had ridden his bike around the world, walked across India, and rowed from Africa to South America.
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