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Why Do Certain Lava Tubes Remain Warm for Decades After Eruption?
为什么某些熔岩管在喷发后数十年仍保持温暖？
精读先不看文字，完整听一遍。
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Lava tubes form when the outer surface of a lava flow cools and hardens while molten rock continues flowing beneath.熔岩管形成于熔岩流外层冷却硬化，而内部熔岩继续流动之时。
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After the eruption ends, residual heat slowly escapes through cracks and porous basalt walls.喷发结束后，残余热量通过裂缝和多孔玄武岩壁缓慢散逸。
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These tubes act like natural insulation because basalt has low thermal conductivity and traps infrared radiation effectively.这些熔岩管具有天然隔热作用，因为玄武岩导热性低，能有效阻隔红外辐射。
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Scientists measure temperatures inside ancient tubes using infrared sensors and find readings up to 20°C above ambient air.科学家用红外传感器测量古熔岩管内部温度，发现读数比环境气温高可达20°C。
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The slow cooling process can last thirty years or more depending on tube diameter and surrounding rock density.缓慢冷却过程可持续三十年以上，具体时长取决于熔岩管直径及周围岩石密度。
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This retained heat supports unique microbial communities that thrive in stable, warm, dark environments.残留热量支撑着独特的微生物群落，使其在稳定、温暖、黑暗的环境中繁盛。
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Unlike surface rocks, tube interiors avoid daily temperature swings, enabling long-term thermal inertia.与地表岩石不同，熔岩管内部不受昼夜温差影响，因而具备长期热惯性。
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Geothermal energy researchers study these systems to model subsurface heat retention in volcanic regions.地热研究人员研究此类系统，以模拟火山地区的地下热量滞留。
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Some caves even host ice deposits despite warm air—proof of complex local humidity-temperature balance.一些洞穴甚至存在冰沉积物，尽管空气温暖——这证明了局部湿度与温度间的复杂平衡。
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Understanding this helps predict geothermal potential and assess hazards near dormant volcanoes.理解这一机制有助于预测地热潜力，并评估休眠火山附近的灾害风险。
精读 · 大约 10 分钟
听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。
③ 学 · 重点表达
- Understanding this helps predict geothermal potential and assess hazards near dormant volcanoes. 理解这一机制有助于预测地热潜力，并评估休眠火山附近的灾害风险。
- Unlike surface rocks, tube interiors avoid daily temperature swings, enabling long-term thermal inertia. 与地表岩石不同，熔岩管内部不受昼夜温差影响，因而具备长期热惯性。
- After the eruption ends, residual heat slowly escapes through cracks and porous basalt walls. 喷发结束后，残余热量通过裂缝和多孔玄武岩壁缓慢散逸。
④ 懂 · 选一选
⑤ 今天会说这一句
Understanding this helps predict geothermal potential and assess hazards near dormant volcanoes.
⑥ 跟读并录音
Understanding this helps predict geothermal potential and assess hazards near dormant volcanoes.
第一版：录下来、回听、再听标准音。系统打分以后再加。
⑦ 说 · 自己来一句
用今天的表达，自己说一句。
例子：Understanding this helps predict geothermal potential and assess hazards near dormant volcanoes.
已记下。连续天数以后会显示在课表里。
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