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“People were dying and we didn’t know why,” Cornman told me. “We didn’t understand the physics of why the planes were crashing.” The deadly gusts were thought to be blowing in from the ocean or from thunderstorms outside the airports. But the danger turned out to be right above them. In the late seventies, researchers at NCAR and the University of Chicago discovered that the crashes were caused by microbursts—sudden, violent downdrafts. In a microburst, a storm cloud dumps cool air and rain straight down, like water from a broken awning. The air spreads horizontally after it lands, so the pilot thinks he’s flying into a headwind at first. He lifts the plane’s nose slightly and decreases the engines’ thrust. Then the downdraft hits, followed by a vicious tailwind, sending the aircraft to the ground.
（二）海上保险事故发生在被保险人已纠正违反保证条款的行为之后。，详情可参考PDF资料
Угрозу применения ядерного оружия в конфликте вокруг Ирана оценили14:57，这一点在下载安装汽水音乐中也有详细论述
Последние новости，这一点在PDF资料中也有详细论述
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