Now, some scientists are worried that such a famine could happen again, but on a much wider scale.

现在，一些科学家担心这样的饥荒可能会再次发生，但规模会大得多。

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About a billion years from now, some scientists say, the sun will be too bright for comfort, and our formerly hospitable planet will no longer be able to support life.

一些科学家声称，再过10亿年，太阳会变的太过灼热明亮，地球也将不再适合生命繁衍生息。

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Until now, some scientists havethought that many individuals of the same species with certain talentscould perform specific tasks better than the same number of individualsfrom different species.

此前，有些科学家认为具有某种特质的同种生物个体比起数量相同、不同种的生物个体在某项任务中的表现更好。

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Some scientists now believe that tension headaches may result from changes among brain chemicals such as serotonin.

VOA: special.2010.03.30

Now some scientists are giving radium, radon and other toxins a second look.

FORBES: Magazine Article

Until now, some scientists have thought that many individuals of the same species with certain talents could perform specific tasks better than the same number of individuals from different species.

ECONOMIST: Marine biodiversity

These were very large compared to what is happening now, but nonetheless some scientists, myself included, are worried that the North Atlantic could be quite sensitive to the smaller amounts of freshening that are occurring now.

NPR: Arctic Freshwater Pouring Into Atlantic, Scientists Say