求翻译：首先，收集的证据直到今天是比较有限。其次，“帝国”理论，是一种常见的名称为各种合并解释，每一个都有自己的有限的事实支持。这也是真正的另六个合并的解释，但帝国建设理论涵盖更广泛的范围比，例如，垄断理论。是什么意思？

First, the evidence collected is somewhat limited until today. Second, the theory of "empire" is a common name for various mergers explain, each with its own limited facts to support. This is also true of the other six combined interpretation of empire building theory covers a wider range than, for

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