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Why Glaciers Flow Like Very Slow Rivers — Not Just Slide Downhill
为什么冰川像极慢的河流一样流动，而不仅是沿山坡滑落？
精读先不看文字，完整听一遍。
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Glaciers move not just by gravity pulling ice downhill, but also by internal deformation under immense pressure.冰川运动不仅受重力驱动，还源于巨大压力下的内部形变。
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Ice crystals slowly slide past one another when temperatures rise near the melting point, even below zero degrees Celsius.当温度接近融点（即使低于0℃）时，冰晶会缓慢相互滑动。
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Basal sliding occurs where meltwater lubricates the glacier’s base, allowing it to glide over bedrock.冰川底部融水起润滑作用，使其能在基岩上滑动，此即底滑作用。
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Scientists measure flow rates using GPS markers embedded in the ice that shift position over months.科学家通过嵌入冰中的GPS标记测量流速，观测其数月内的位置变化。
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Thicker glaciers deform faster because pressure increases with depth, weakening the ice structure internally.冰川越厚，内部压力越大，冰体结构越易弱化，形变速率也越快。
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Crevasses form where flow speeds change abruptly, revealing how stress builds and releases within the ice mass.当冰川流速骤变时，便形成冰裂缝，反映出冰体内应力的积累与释放。
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Some glaciers surge suddenly, moving hundreds of meters in weeks due to trapped subglacial water release.部分冰川会突发性跃动，因封存于冰下的水突然释放，数周内可移动数百米。
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Climate warming accelerates both melting and flow, altering sea level and freshwater supplies globally.气候变暖同时加速消融与流动，全球海平面与淡水资源随之改变。
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Glacier movement records past climate conditions in layers of trapped air bubbles and dust.冰川运动将空气气泡与尘埃封存在冰层中，记录着过去的气候状况。
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Studying this slow motion helps predict future coastal flooding and mountain water availability.研究这种缓慢运动有助于预测未来沿海洪灾与山区水资源供应。
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
- Studying this slow motion helps predict future coastal flooding and mountain water availability. 研究这种缓慢运动有助于预测未来沿海洪灾与山区水资源供应。
- Thicker glaciers deform faster because pressure increases with depth, weakening the ice structure internally. 冰川越厚，内部压力越大，冰体结构越易弱化，形变速率也越快。
- Climate warming accelerates both melting and flow, altering sea level and freshwater supplies globally. 气候变暖同时加速消融与流动，全球海平面与淡水资源随之改变。
④ 懂 · 选一选
⑤ 今天会说这一句
Studying this slow motion helps predict future coastal flooding and mountain water availability.
⑥ 跟读并录音
Studying this slow motion helps predict future coastal flooding and mountain water availability.
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：Studying this slow motion helps predict future coastal flooding and mountain water availability.
已记下。连续天数以后会显示在课表里。
陈老师指导
课程开发中，敬请期待。成人和孩子都可以先自学听读、精读。
这边的讲解音轨还在做。想先跟着老师走完固定 30 课，可以去陈老师带读社（和自学通行不是同一份会员）。
课程开发中，敬请期待。