工程人员讲到，要耗费几天时间去更换和测试开关盒，以确保燃料管道加热器正常运转。 上周五，仅在发射前几小时，“奋进号”飞船的发射被取消了。
Engineers say it will take several days to replace and test that switch box to ensure fuel line heaters are functioning properly.
每台送风机的出口发兰到空气加热器的一组管道。
One set of ducts from outlet flange of each forced draft fan to air heaters.
每台送风机的出口发兰到空气加热器的一组管道。
One set of ducts from outlet flange of each forced draft fan to air heaters.
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