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Lake Baikal: The World’s Deepest and Oldest Freshwater Rift Basin
贝加尔湖：世界最深最古老的淡水裂谷湖
精读先不看文字，完整听一遍。
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Lake Baikal lies in a tectonic rift valley where the Eurasian Plate slowly pulls apart.贝加尔湖位于欧亚板块缓慢张裂的构造裂谷中。
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At 1,642 meters deep, it holds 20% of Earth’s unfrozen freshwater and formed over 25 million years ago.湖深1642米，蕴藏地球20%的未冻结淡水，形成于2500多万年前。
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Its isolation and stable cold climate allowed unique species like the Baikal seal to evolve nowhere else.其地理隔绝与常年寒冷稳定的气候，使贝加尔海豹等特有物种仅在此演化。
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Underwater faults and hydrothermal vents sustain chemosynthetic communities far below sunlight zones.水下断层与热液喷口在无光带深处维系化能合成生物群落。
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Sediment layers in its basin preserve continuous climate records spanning millions of years.湖盆沉积层保存了跨越数百万年的连续气候记录。
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Waters remain exceptionally clear due to endemic crustaceans that filter algae year-round.特有甲壳类全年滤食藻类，使湖水异常清澈。
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The Selenga River contributes half the inflow but also carries mining runoff threatening water quality.色楞格河贡献一半入水量，但也携带来自采矿业的径流，威胁水质。
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Winter ice cover reaches one meter thick, yet cracks form predictable patterns revealing subsurface stress fields.冬季冰盖厚达一米，但冰面裂纹呈现可预测模式，揭示地下应力场。
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Local communities rely on fisheries and eco-tourism, both constrained by strict UNESCO World Heritage protections.当地社区依赖渔业与生态旅游，二者均受联合国教科文组织世界遗产严格保护限制。
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Climate warming accelerates ice melt, altering thermal stratification and disrupting endemic food webs.气候变暖加速冰层消融，改变水体热分层，扰乱特有食物网。
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
- Underwater faults and hydrothermal vents sustain chemosynthetic communities far below sunlight zones. 水下断层与热液喷口在无光带深处维系化能合成生物群落。
- Waters remain exceptionally clear due to endemic crustaceans that filter algae year-round. 特有甲壳类全年滤食藻类，使湖水异常清澈。
- Sediment layers in its basin preserve continuous climate records spanning millions of years. 湖盆沉积层保存了跨越数百万年的连续气候记录。
④ 懂 · 选一选
⑤ 今天会说这一句
Underwater faults and hydrothermal vents sustain chemosynthetic communities far below sunlight zones.
⑥ 跟读并录音
Underwater faults and hydrothermal vents sustain chemosynthetic communities far below sunlight zones.
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：Underwater faults and hydrothermal vents sustain chemosynthetic communities far below sunlight zones.
已记下。连续天数以后会显示在课表里。
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