We need an expert to clear up this theoretical problem.

我们需要一位专家来搞清楚这个理论问题。

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We need an expert to guide us through teh labyrinth of rules and regulations on this subject.

我们需要一名专家指点一下这方面的错综复杂的规章制度。

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We need the help of an expert.

我们需要专家的帮助。

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We need the help of an expert.

我们需要专家的帮助。

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