It will be necessary to replace it with a spare unit.
有必要用一个备用部件来替换它。
For the STS-133 mission, Discovery carried supplies, spare parts, and the Permanent Multipurpose Module, a storage unit that's the final piece of the International Space Station.
在此次STS - 133任务中，“发现号”携带了补给、备用部件以及国际空间站的最后一个舱室-永久性多功能存储单元舱。
On the base of the research of spare fill rate, we established mission availability models of multi combat unit when order and logical relation of mission is full collateral and parallel.
对作战单元部件备件满足率进行研究的基础上，针对任务时序逻辑关系为完全并行并联关系的情况，建立了多个作战单元任务的任务成功概率模型。
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