“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.
值得注意的是，虽说是持续5年的民主监督，但各专委会每年确定的侧重点并不相同。
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第三十九条 船长应当将船上发生的出生或者死亡事件记入航海日志，并在两名证人的参加下制作证明书。死亡证明书应当附有死者遗物清单。死者有遗嘱的，船长应当予以证明。死亡证明书和遗嘱由船长负责保管，并送交家属或者有关方面。
Rodney Benson, a media professor at New York University, called the deal "concerning", would leave America's largest media companies further concentrated in the hands of conservatives. Many of those owners, including the Ellison family, have separate, non news-related business interests that depend on government contracts or regulation and are therefore particularly vulnerable to pressure, he adds.