four furnaces and one tower 四炉一塔
four furnaces
四个炉
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Geothermal is four times as efficient as fossil-fuel-burning furnaces and twice as efficient as a conventional air conditioner.
地热系统的效率是石油燃料炉子的4倍，是常规空调的2倍。
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On average the industry shuts down its furnaces for four months every six years to reline them.
FORBES: The Cortez of steel doesn't look back
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