美国地质调查局并不是唯一探索这个问题的机构。

The USGS is not the only group exploring the problem.

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进行探索性的调查；搜寻。

To conduct an exploratory investigation; search.

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它们决定了对一个特殊方案进行探索调查的可行性程度。

They determine the range of investigative possibilities for a particular solution.

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它们决定了对一个特殊方案进行探索调查的可行性程度。

They determine the range of investigative possibilities for a particular solution.

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