Flight controllers tried to restart the disabled ammonia pump early on Sunday but the circuit breaker tripped again.

飞行控制系统试图在周日前使不能工作的氨气泵重新工作，不过断路器跳闸了。

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A new type of dry gas seal structure and working principle applied on high pressure ammonia pump were recommended.

介绍了一种新型高压氨泵采用干气密封的结构及工作原理。

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On the base of the reasons, several measures to promote its property are put forward to avoid more damages of the cold ammonia pump.

在分析上述原因的基础上，提出了几项改进措施，从而可避免冷氨泵的损坏。

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Flight controllers tried to restart the disabled ammonia pump early on Sunday but the circuit breaker tripped again.

BBC: Cooling system fault hits International Space Station

Any repairs later this week almost certainly will involve replacing the faulty ammonia pump, a difficult job that would require two spacewalks, AP adds.

BBC: Cooling system fault hits International Space Station

The ammonia pump was the chief suspect going into Saturday's spacewalk.

WSJ: Spacewalkers Replace Space Station Pump