Researchers studying how genes control animal behavior have had to deal with many uncertainties.

研究基因如何控制动物行为的研究人员不得不面对许多不确定因素。

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Since there are so many uncertainties, especially with regard to what human beings will choose to do and how large the climate response will be, "we don't pretend we can do it accurately."

因为有太多的不确定性，尤其是考虑人类选择如何去做而气候如何响应，“我们不假装我们能做到很准确。”

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With such uncertainties, it is little wonderthat many doctors have fallen back on more traditional approaches toeasing the pain, like exercise or counseling.

由于存在如此种种不确定因素，也难怪医生们会退而寻求更传统的治疗方式来缓解背痛，如锻炼或是心理咨询。

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With so many uncertainties, the Greek economy cannot hope to attract the investment it needs to spur recovery.

ECONOMIST: Greece and the euro

Investors around the globe are on the edge of their seats and the U.S. stock market is emotional, especially now, with so many uncertainties up in the air.

FORBES: Worried About Investing In 2013? Buy American and Prosper

With so many uncertainties still to be resolved, investment in the UK nuclear sector was still a "leap of faith", said George Borovas, head of nuclear projects at global law firm Pillsbury.

BBC: Hitachi buys UK nuclear project from E.On and RWE