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The Bering Strait: A Narrow Seaway Linking Oceans and Migratory Corridors
白令海峡：连接两洋与生物迁徙廊道的狭窄水道
精读先不看文字，完整听一遍。
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Only 85 kilometers wide, the Bering Strait separates Russia and Alaska while linking the Pacific and Arctic Oceans.白令海峡仅宽85公里，分隔俄罗斯与阿拉斯加，同时连接太平洋与北冰洋。
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Its shallow depth—less than 50 meters—allowed human and animal migrations during Pleistocene glacial low-sea stands.其浅水深度不足50米，使更新世冰期海平面降低时人类与动物得以迁徙。
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Cold Arctic waters flow south while warmer Pacific waters move north, creating turbulent mixing zones rich in plankton.寒冷的北冰洋海水南下，温暖的太平洋海水北上，在此形成富含浮游生物的湍急混合区。
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Gray whales travel 20,000 km annually through this corridor, feeding in Arctic shelves and calving in Mexican lagoons.灰鲸每年经此通道迁徙2万公里，于北极大陆架觅食，在墨西哥潟湖产仔。
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Sea ice extent fluctuates dramatically, influencing shipping routes and marine mammal behavior each season.海冰范围季节性剧烈变化，影响航运路线及海洋哺乳动物行为。
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Submarine canyons channel deep-water currents that affect regional ocean heat distribution and sea-level rise projections.海底峡谷引导深层洋流，影响区域海洋热量分布及海平面上升预测。
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Indigenous communities rely on seasonal sea-ice platforms for hunting seals and walruses across dynamic frozen terrain.原住民依靠随季节变化的海冰平台，在动态冰面上猎捕海豹与海象。
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Oil exploration and increased vessel traffic raise risks of spills in waters with limited response capacity and slow biodegradation.石油勘探与船舶交通增加，加剧了溢油风险——当地应急能力有限，污染物降解缓慢。
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Tidal ranges exceed three meters here, exposing intertidal zones where clams and crabs support migratory shorebirds.此处潮差超三米，裸露的潮间带为蛤蜊与螃蟹提供栖息地，支撑候鸟生存。
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Geopolitical boundaries cross ecologically unified marine space, demanding cooperative monitoring of shared species and habitats.地缘政治边界横跨生态连贯的海洋空间，亟需合作监测共有的物种与栖息地。
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
- Sea ice extent fluctuates dramatically, influencing shipping routes and marine mammal behavior each season. 海冰范围季节性剧烈变化，影响航运路线及海洋哺乳动物行为。
- Its shallow depth—less than 50 meters—allowed human and animal migrations during Pleistocene glacial low-sea stands. 其浅水深度不足50米，使更新世冰期海平面降低时人类与动物得以迁徙。
- Submarine canyons channel deep-water currents that affect regional ocean heat distribution and sea-level rise projections. 海底峡谷引导深层洋流，影响区域海洋热量分布及海平面上升预测。
④ 懂 · 选一选
⑤ 今天会说这一句
Sea ice extent fluctuates dramatically, influencing shipping routes and marine mammal behavior each season.
⑥ 跟读并录音
Sea ice extent fluctuates dramatically, influencing shipping routes and marine mammal behavior each season.
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：Sea ice extent fluctuates dramatically, influencing shipping routes and marine mammal behavior each season.
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。