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At the same time, people continue to treat fire as an event that needs to be wholly controlled and unleashed only out of necessity, says Professor Balch at the University of Colorado.

科罗拉多大学的鲍尔奇教授说，与此同时，人们一直把火当作一个需要完全控制且只有在必要的情况下才会让其释放的事件。

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Dr Balch has done a back-of-the-envelope calculation.

鲍尔奇博士做过一个事后计算。

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"I don't think a robot will ever be better than a person, " Balch said.

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Instead, her October 2008 surgery at the Tampa, Florida- based center left Balch incontinent, with a dangerous spinal fluid leak, she said.

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Balch sued Laser Spine, alleging malpractice, in December 2009, one of 15 cases filed against the company in the past 18 months.

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