它本应在星期五离地，但是现在还留在地面，因为与液压动力装置相连的一个开关箱发现有电气故障。
It should have left Earth on Friday but has been held on the ground because of an electrical failure in a switchbox connected to a hydraulics power unit.
辅助动力装置是飞机内的小涡轮发动机，在地面或空中给各系统提供电源和气源。
A small turbine engine in the airplane for supplying electrical and pneumatic power for systems operation on the ground or in flight.
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