也就是说，有比你设想中更多的直升机坠落下去。
It seems that more helicopters go down than you might think.
偶尔，他还会想象他的妻子死于非命——或者是一辆翻滚而下的起重机，或者一架盘旋坠落的直升机。
Occasionally he imagines her falling victim to a freak accident—a tumbling crane, say, or spiralling helicopter.
航空科技：源自于太空梭的可折叠机械结构缓冲垫有助于保护坠落中的直升机。
Aviation: How a collapsible mechanical cushion, borrowed from a space capsule, could help protect a crashing helicoptetr
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