There’s just one hitch: the system still needs guinea pigs. Even the best weather models can’t pinpoint where clear-air turbulence will occur. So the NCAR programs continue to rely on firsthand reports from planes that have already been tossed around. New technologies could change that in coming years. A plane equipped with a lidar sensor—which uses lasers to detect much finer particles than radar can—could pick up on turbulence even in a cloudless sky. But lidar systems are still too bulky and expensive to fit into a plane’s nose cone. And the government and the airline industry have been slow to invest in improving them. For now, the best hope for a flight heading into turbulence might be to program the plane itself to ride the bumps.
Последние новости
。业内人士推荐体育直播作为进阶阅读
王天：不单纯是能量守恒，更像一套“汽车混动系统”。人在徒步、爬山时，活动量远超日常水平。一旦肌肉感到疲劳，就会快速消耗糖原，人会产生“力竭感”，不仅走不动，还容易受伤。
Sizes: 13- and 15-inch models