作业环境对于工人来说正在变得越来越危险，这意味着修复冷却系统以及挂接重要的测量仪器将花费更长的时间。

And conditions for workers are getting more dangerous, which means that fixing up the cooling systems and hooking up vital measuring instruments takes longer.

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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.

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太空行走修复老化哈勃望远镜的仪器问题。

Equipment problems have bedevilled the penultimate space walk to repair the aging Hubble telescope.

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