Many believe chocolate has the power to lift mood, and the US team say this may be true, although scientific proof for this is lacking.

虽然科学证据不足，但许多人相信吃巧克力可以提高情绪。美国队说这也许是正确的。

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A few months ago, I searched for real scientific proof to see whether it works and although there is little study, wheatgrass itself has proven itself with many health benefits.

几个月前，我搜寻了真实的科学依据来证实麦草是否真有如此神效。虽然得到的研究结果很少，但麦草已证明了它对健康有很多好处。

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At present it is generally accepted, although more as a self-evident statement than on the base of a closely-reasoned scientific proof.?

目前，这个观点已被普遍接受，虽然它是不言而喻的，并不是根据科学严密推理而证明的。？。

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In Vietnam many believe that ground rhino horn can be used to cure cancer - although there is no scientific proof of this - and horns taken to the the Middle East are used to make handles for ornamental daggers.

BBC: South Africa record for rhino poaching deaths

And although we've known that for years, this is the first big scientific proof of that relationship.

CNN: Simple test may determine smokers' lung cancer risk