The physics of squeaking sneakers

· · 来源:tutorial资讯

When disaster strikes on a flight these days, it’s almost never the way we fear. The wings won’t rip off in a gale. The plane won’t get thrown into a mountain. In the seven decades since the first paying passengers flew on a commercial jet airliner—from London to Johannesburg in 1952—the number of commercial flights has increased exponentially, while the risk of dying on one has grown incredibly small. “It works out to a probability of fatal injury of one in forty-six million flights on U.S. and E.U. airplanes,” Jacob Zeiger, the air-safety investigator at Boeing, told me. When an accident does happen, it’s usually because of human error or a ground collision or some combination of factors, including the simple act of walking around on a bumpy flight.

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processed by machines, do we really need to courier them to rooms full of,这一点在体育直播中也有详细论述

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