Dietary supplements and weight-loss aids aren't subject to the same rigorous standards as are prescription drugs. Thus, they can be sold with limited proof of effectiveness or safety.

膳食营养品和辅助减肥产品并不像处方药一样要按照非常严格的标准来，因此只要出示有限的有效性安全性证明，就可以出售。

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Once their effectiveness has run its course, memory loss and cognitive decline progress unimpeded, and sometimes even accelerate.

一旦这药性发挥既定功效，那么记忆丧失和认知下降就将肆虐横行，有时甚至会加快痴呆的出现。

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Each and every idle loss ratio has been checked against actual measurement for accuracy and effectiveness in identifying local defects in windings and cores of transformers.

并结合实际测量数据，详细分析了单相空载损耗比对发现变压器线圈和铁心局部缺陷的准确性和有效性。

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Not only is healthy weight hard to achieve, but showing the cost-effectiveness of weight-loss programs in the workplace also proves evasive.

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"Similar technologies are limited by cost of materials, use of noxious chemicals in the application or loss of effectiveness after a few washings, " said Gennaro Gama from the University of Georgia Research Foundation (UGARF).

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"Our belief is that women will be invited to compelling advertising and marketing messages to experiment on themselves with a drug that has some effectiveness with healthy weight loss but possible serious risks, " said Cindy Pearson, executive director of the National Women's Health Network.

CNN: FDA approves new diet drug