你认为今晚找到一架备用飞机的机会是多少？
Well, what do you think the chances are of you finding a replacement plane.
我们公司制造的备用飞机零件领先于其他制造商。
Our company is ahead of other makers of spare parts for the airplane.
6名空间站宇航员不得不暂用俄罗斯舱段内的备用厕所，"奋进"号7名机组成员暂用航天飞机上的厕所。
The 6 residents had to use a back-up toilet in the Russian part of the station and Endeavour's 7 astronauts were restricted to the craft's loo.
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