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Why Glaciers Flow Like Slow-Moving Rivers Despite Being Solid Ice
为何冰川虽为固态冰却能像缓慢流动的河流
精读先不看文字，完整听一遍。
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Glaciers move because immense pressure from accumulated snow transforms lower ice layers into a ductile, crystalline form that deforms gradually.冰川运动是因为积雪产生的巨大压力，使下层冰转变为可塑性晶态冰，从而缓慢变形。
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Ice crystals reorient under stress, allowing grains to slide past one another in a process called creep deformation.冰晶在应力作用下重新定向，使晶粒通过蠕变变形相互滑动。
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Meltwater at the glacier base lubricates the bedrock interface, enabling basal sliding that accounts for up to 70% of total motion.冰川底部融水润滑冰岩界面，促成基底滑动，贡献总运动量的70%。
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Satellite radar interferometry measures millimeter-scale shifts daily, revealing how flow speeds accelerate near valley constrictions.卫星雷达干涉测量每日监测毫米级位移，揭示冰川在峡谷缩窄处流速加快现象。
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Temperature gradients within the ice affect viscosity—colder glaciers flow slower but fracture more easily under strain.冰内温度梯度影响黏度：温度越低，冰川流动越慢，但受力时更易破裂。
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Scientists drill boreholes to install tiltmeters that record internal ice deformation rates at different depths.科学家钻孔安装倾斜仪，记录不同深度冰体内部变形速率。
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Seasonal melt cycles cause short-term speed-ups known as 'surges', which reshape fjords and deposit moraines unpredictably.季节性消融循环引发短期加速现象——‘跃动’，重塑峡湾并不可预测地堆积终碛。
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Glacier flow models incorporate grain size, impurity content, and geothermal heat to predict retreat rates under climate scenarios.冰川流动模型纳入晶粒尺寸、杂质含量和地热通量，以预测不同气候情景下的退缩速率。
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This solid-state flow differs fundamentally from liquid rivers but obeys similar conservation laws for mass and momentum.这种固态流动与液态河流有本质区别，但仍遵循质量与动量守恒定律。
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Understanding it helps forecast sea-level rise contributions from polar ice sheets with greater precision.深入理解该机制有助于更精准预测极地冰盖对海平面上升的贡献。
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 it helps forecast sea-level rise contributions from polar ice sheets with greater precision. 深入理解该机制有助于更精准预测极地冰盖对海平面上升的贡献。
- Satellite radar interferometry measures millimeter-scale shifts daily, revealing how flow speeds accelerate near valley constrictions. 卫星雷达干涉测量每日监测毫米级位移，揭示冰川在峡谷缩窄处流速加快现象。
- Scientists drill boreholes to install tiltmeters that record internal ice deformation rates at different depths. 科学家钻孔安装倾斜仪，记录不同深度冰体内部变形速率。
④ 懂 · 选一选
⑤ 今天会说这一句
Understanding it helps forecast sea-level rise contributions from polar ice sheets with greater precision.
⑥ 跟读并录音
Understanding it helps forecast sea-level rise contributions from polar ice sheets with greater precision.
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 it helps forecast sea-level rise contributions from polar ice sheets with greater precision.
已记下。连续天数以后会显示在课表里。
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课程开发中，敬请期待。