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请教句子结构:reasons that were to varying degrees economic and nat

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请教句子结构:reasons that were to varying degrees economic and nationalistic.
For centuries,explorers have risked their lives venturing into the unknown for reasons that were to varying degrees economic and nationalistic.
几百年来,探险家们冒着生命危险去探搜未知领域,他们说服自己的理由是去改变经济形式以及民族主义的程度.
reasons that were to varying degrees economic and nationalistic
属于同位语从句,它的作用相当于名词,对前面的名词加以补充说明或进一步解释
不是定语从句,一般reason引导的定语从句先行词都是why ,就算用that ,后边加的内容也不是直接说原因的,都是修饰原因的,例如the reason he told me is ridiculous
而不是像这种的直接说原因是什么的