第三个风险是，消费者可能会推断出预期的结论，但对其推论的有效性提出质疑。

A third risk is that consumers may infer the intended conclusion but question the validity of their inference.

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如果经销商对FDA的权威提出质疑，FDA可以要求他们提供产品安全性和有效性的证明。

FDA can ask for the proof of safety and effectiveness of a product if its distributors challenge FDA's authority.

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本文对“句内后照应单向性”论点的有效性提出质疑。

This paper questions the validity of the claim that intra-sentential cataphoric reference is unidirectional.

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