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The FIFA team also concluded that altitude is likely to alter the aerodynamics of the ball in a way that could catch players out.

FIFA团队也推断，海拔可能会改变足球的空气力学，这样的话很可能会让球员们出错。

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A pilot from another airline said dealing with such a depressurization emergency at that altitude would have been frightening and challenging.

另一家航空公司的机长表示在那样的高度紧急处置机舱减压是可怕的和具有挑战性的。

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And it only affects those flights that are going to go through that airspace in that period of time at that altitude.

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"The executive committee have listened to a proposal from the medical committee and have decided to act because to play at above that altitude is not healthy or fair, " he said.

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That wind was traveling at 120 miles an hour, so we ended up with Felix in the capsule under this 30-million-cubic-foot balloon flying at 125 miles an hour to the east, which is amazing to think about, because at that altitude, it's the equivalent of about a 50-story building.

ENGADGET: Art Thompson, Red Bull Stratos' technical project director, talks circuit breakers, wind shear and biomedical data