Outdoor ground-type fire hydrant 室外地上式消火栓
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The ground already contains quite a bit of jet fuel leaked from older hydrant pipe systems that was not detected by the existing SCADA instrumentation.
地上已经有了许多原先从输油管线中泄漏出来的飞机燃料，都是SCADA系统没能探测到的泄漏所引起的。
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