backup coolant system
... backup breaker 备用断路器 backup coolant system 备用冷却剂系统 backup data 备查资料 ...
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包括两个冷却剂系统水泵在内的备用组件都在舱里，安装工作被普遍认为是艰难的，必须进行两次太空行走。
Spare components are on board, including two coolant system pumps, but installation is considered difficult and two spacewalks will be required.
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