此外，很难否定这个结论，就是各州之间有关房屋成本的变化，虽然扮演着重要的角色，然而肯定不是唯一起作用的因素。

Moreover, it is hard to avoid the conclusion that changes in relative housing costs between states, while certainly not the only factor at work, have played an important role.

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例如在民事纠纷的案子中，志愿者甚至可能与警察扮演了相同的角色(起相同的作用)。

In cases such as civil disputes, volunteers may even play the same roles as police officers.

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