But what if it’s not fine? Even back in 1996, before a single component of the ISS was launched into orbit, NASA foresaw the possibility of an even worse worst-case scenario: an uncontrolled reentry. The crux of this scenario involves multiple systems failing in an improbable but not completely impossible cascade. Cabin depressurization could damage the avionics. The electrical power system could go offline, along with thermal control and data handling. Without these, systems controlling coolant and even propellant could break down. Unmoored, the ISS would edge slowly toward Earth, maybe over a year or two, with no way to control where it is headed or where its debris might land. And no, we could not save ourselves by blowing the station up. This would be extremely dangerous and almost certainly create an enormous amount of space trash—which is how we got into this hypothetical mess in the first place.
更深层次的带动，实际上在于城市建设的提速、体育赛事上下游产业的发展。特别是对于目前处于发展转折点、关键期的沣东而言，将倒逼西安国际足球中心周边建设的加速，包括商业、酒店、交通等配套的完善，以及城市绿化的提升。
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But that only goes so far. When someone in the crowd shouted "Play the Spice Girls!", he responded with a swift riposte: "Sorry, I don't take requests."
Tony Jolliffe/BBC News
Comparison of error-diffusion vs ordered dithering using an 8-colour irregular palette. Left to right: original image, error-diffusion, ordered.