[求助]一个关于form of business organization的问题

纯爷么

书上说：
...corporations are the dominant form of business organizations in terms of volume of operations.
还有：
In terms of economic importance, the corporation is the dominant form of business organization in the United states.
这两句话可以被懂得成以下的话吗？
Corporations     are the dominant form of business because the majority of U.S. businesses     are incorporated.

我觉得好像不一样，又不断定。菜鸟一枚，肯请大虾们解惑，多谢。

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