每步通过其名字定义树节点(尽管存在其他可能性)。
Each step generally identifies tree nodes by their name (although other possibilities exist).
尽管亚美利格-韦斯普奇（Amerigo Vespucci，意大利航海家，美洲新大陆以其名字命名）证实美洲实际上不是印度，印第安人这个名字实际上一直被使用，直到1960年前后被土著居民取代。
Despite Amerigo Vespucci ascertaining that the Americas were not actually India, Indian continued to be used as the de facto name for native inhabitants until around 1960.
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