A few years ago, Cornman found a way around the problem. In the U.S., commercial flights served by air-traffic control—some twenty-seven thousand a day—are required to transmit their position, altitude, and velocity. By tracking those transmissions and the planes’ motions over time, a new program that Cornman developed at NCAR can create a moment-by-moment snapshot of turbulence as it’s happening. The F.A.A. is planning to test the program this year. Together with NCAR’s earlier software, Sharman’s forecasting models, and data from radar arrays on the ground, this system could start to give pilots the advance warning they need. “That is the future for me,” Cornman said. “All these operations get integrated in a seamless network. The pilots don’t have to talk to air-traffic control and say, ‘Should I go up or down?’ They just get a display with a color-coded flight track on it. And they see that it looks better a few thousand feet up.”
Musk said posts he wrote after he had struck a deal to buy the platform were "extremely literal" and not intended to try to reduce the price he would have to pay.
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（五）政策协同发力构建消费增长的长效机制。业内人士推荐电影作为进阶阅读
Most of the infrastructure will have been built just weeks before the event, but failure is not an option for sports events in particular. It's obviously unacceptable, says Wilson, "If you're five seconds late for the 100 metres."