Another module continued to pump coolant through a separate loop, but astronauts had to power down non-essential equipment to prevent overheating.

另一个模块继续通过一个单独的循环泵入冷却剂，但宇航员不得不关掉不必要的设备以防止过热。

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The heat produces steam in a separate loop that drives the plant's turbines and generators.

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Cost savings through scale are difficult when planes are tied to separate maintenance schedules and pilots need to be taken out of the productive loop for three months for retraining.

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