For example, when the Wright brothers first flew in 1903, all the mechanics and theories necessary — from the piston engine to wing aerodynamics — already existed. The Wrights just had to push the technology a bit further by putting the right parts together and adding some key insights of their own.
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。关于这个话题，safew官方版本下载提供了深入分析
第十五条 自然保护区区域范围的划定应当统筹考虑自然生态系统等保护对象分布区域的完整性、管理可行性和周边经济社会发展的需要，坚持实事求是、科学合理，经过充分调查和科学论证。
Actively scaling? Fundraising? Planning your next launch?
“This is sort of choose your own adventure,” Ryan Pettit, a technical fellow with Boeing’s flight-controls division, told me. We were sitting in the pilot seats of a multipurpose simulator cab. From the inside, it looked like the flight deck of a 777, complete with banks of gauges, switches, and digital screens, and a view of Mt. Rainier through the windshield. From the outside, it looked like a giant, one-eyed robot: a cabin perched on three mechanical legs more than two stories tall. In months of chasing turbulence, the closest I’d come to it on a commercial flight was in Texas, when a thunderstorm struck my plane just as it was preparing to land in Austin. “Folks, it looks like it’ll be smooth sailing for the first hour and forty-five minutes,” the pilot had warned, as we left New York. “Then it’s all downhill from there.” But this simulator was nothing if not reliable. It was turbulence on demand.