Animal testing is expensive and can be of dubious value, and scientists would prefer cheaper and more reliable alternatives.

动物实验成本高昂，而且不一定有价值，科学家更愿意采用便宜可靠的替代方法。

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Some suspect that its opposition stems from the fear that many expensive and profitable pills would be found to be of dubious value.

一些人猜测反对的原因是担心很多价格昂贵获利丰厚的新药很可能物非所值。

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Some suspect that its opposition stems from the fear that many expensive and profitable pills would be found to be of dubious value.

ECONOMIST: Developing new drugs

But the insidious culture that allowed Wall Street firms to peddle securities of dubious value to pension funds and charitable endowments remains largely in place.

NEWYORKER: What Good Is Wall Street?

Since most digital advertising is a total numbers game, it might take a while for agencies and their clients to realize what portion of their Like-spend is going to acquire fans and attendent search results of dubious value.

FORBES: Facebook Graph Search Runs On Likes That Advertisers Have Already Paid For