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Turbulence is rarely that simple. It’s too scattered, too mercurial, too easily triggered by weather patterns that trigger other patterns in an endless cascade. “It’s not just one thing that’s going on,” Bob Sharman, an atmospheric scientist at NCAR, told me. “It’s not just atmospheric convection. It’s not just wind flowing over mountains. It’s everything going on all the time and interacting.” Sharman is one of the country’s preëminent authorities on turbulence prediction. The computer models that he has built can predict where rough air is most likely to arise. “The problem is,” he said, “when we go to meetings with the airline industry and suggest a probabilistic approach, a pilot will stand up and say, ‘No! I want you to tell me if there will be turbulence at this place, at this time.’ ” Sharman threw up his hands. “Nobody knows that. I understand that, in theory, you would want that. But, in practice, that is just not possible.”
博科娃出生于保加利亚首都索非亚,曾任保加利亚驻法国、摩纳哥大使和保加利亚驻联合国教科文组织大使,2009年至2017年担任联合国教科文组织总干事,是该组织的第一位女性总干事。她推动9项中国重要文化遗产入选联合国教科文组织《世界遗产名录》、11座中国城市纳入联合国教科文组织创意城市网络,并对中国在文化遗产保护和创意产业方面的积极作为予以高度评价。