哈勃望远镜的工作寿命一而再地得到了延长，航天飞机宇航员也完成了5次维修任务。他们不仅修复了出故障的元件，而且为仪器升了级，给仪表更换了电池。
Hubble's life has been extended time and again through five servicing missions in which space shuttle astronauts have fixed faulty components, upgraded instrumentation and replaced batteries.
将电子机械拆开，更换有故障的电子元件或机械部分，比如：齿轮、电刷、电枢等。
Dismantles electrical machinery and replaces defective electrical or mechanical parts such as gears, brushes, and armatures.
重要：加热元件的拆卸和更换涉及到水管的拆卸和电路连接的断开。
IMPORTANT: Removal and replacement of the heating element involves the disconnection of water piping connections and electrical connections.
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