Friday's glitch started with an errant heater in one of the three auxiliary power units (APUs) in Endeavour - all of which must be in perfect working order for a launch to be allowed to proceed.

星期五的小故障从一个出错的加热器开始，它在奋进号的三个辅助动力装置之中的一个装置之内——为了允许进行发射，所有这些装置都必须处于完好运转状态。

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