AZT's value in fighting AIDS has come under new doubt.

AZT在抵御艾滋病上的价值再度受到怀疑。

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Dr David Haslam, of the National Obesity Forum, said the finding cast new doubt on the merits of Body Mass Index (BMI) as a way to assess whether somebody was unhealthily overweight, as it did not differentiate between different types of fat.

BBC: Type of body fat 'boosts health'

And the new constraints drive new questions, new interactions, and, without a doubt, new outcomes.

FORBES: Innovation: A Tale of Language, Marissa Mayer, Francis Bacon and the Sonnet

This old meets new world in Makkah no doubt is a whole new world for many of the pilgrims, some of them from far-flung villages where many haven't even been on a plane before, let alone had a McDonald's Big Mac.

CNN: Preparing to cover The Hajj