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

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。

youdao

That means their safety and effectiveness is not proved.

这就意味着它们的安全和疗效并未得到证明。

youdao

However there are still many unknowns surrounding the safety and effectiveness of that strategy.

然而，关于此道的安全性与有效性仍有许多未知数。

youdao

Then, they did preliminary studies of safety and effectiveness in people.

接着,研究人员对疫苗在人体中的,安全性和有效性进行初步研究

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That would mean clear evidence about Vytorin's safety and effectiveness might never be obtained.

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Although some might swear by these remedies, scientific evidence of their safety and effectiveness is lacking.

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The safety and effectiveness of Xarelto for the new indications were evaluated in three clinical studies.

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