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The Sahara: From Green Pastures to Golden Sand
撒哈拉：从青翠牧场到金色沙海
精读先不看文字，完整听一遍。
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About 10,000 years ago, the Sahara was covered with grasslands, lakes, and rivers that supported cattle herding and fishing.约1万年前，撒哈拉地区遍布草原、湖泊与河流，支撑着畜牧和渔业。
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This ‘Green Sahara’ period ended gradually as Earth’s orbital tilt shifted, reducing summer monsoon rains over North Africa.这一‘绿色撒哈拉’时期随着地球轨道倾角变化而逐渐结束，北非夏季季风降雨随之减少。
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Rock art in Algeria’s Tassili n’Ajjer shows giraffes and crocodiles—species that vanished when the desert expanded.阿尔及利亚塔西利-纳杰尔的岩画描绘了长颈鹿和鳄鱼——这些物种在沙漠扩张后消失。
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Today, fossil aquifers beneath the sand hold more water than the Nile River carries in fifty years.如今，沙层之下埋藏的化石含水层储水量超过尼罗河50年的径流量。
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Solar farms in Morocco and Egypt now tap the region’s abundant sunlight, generating clean energy for growing coastal cities.摩洛哥和埃及的太阳能电站正利用该地区丰富的阳光，为不断扩张的沿海城市提供清洁能源。
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Nomadic Tuareg communities maintain ancient trade routes across dunes, using star navigation and oral geography knowledge.游牧的图阿雷格人沿沙丘间的古老商路穿行，依靠星象导航与口传地理知识。
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Dust storms from the Sahara travel across the Atlantic, fertilizing the Amazon rainforest with phosphorus-rich particles.撒哈拉扬起的沙尘暴横跨大西洋，将富含磷的颗粒输送至亚马孙雨林，为其提供养分。
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Scientists drill lake sediments in Chad’s Bodélé Depression to reconstruct past climate shifts recorded in mineral layers.科学家在乍得博德莱洼地钻取湖相沉积物，通过矿物层重建过往气候变迁。
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
- Rock art in Algeria’s Tassili n’Ajjer shows giraffes and crocodiles—species that vanished when the desert expanded. 阿尔及利亚塔西利-纳杰尔的岩画描绘了长颈鹿和鳄鱼——这些物种在沙漠扩张后消失。
- Nomadic Tuareg communities maintain ancient trade routes across dunes, using star navigation and oral geography knowledge. 游牧的图阿雷格人沿沙丘间的古老商路穿行，依靠星象导航与口传地理知识。
- Dust storms from the Sahara travel across the Atlantic, fertilizing the Amazon rainforest with phosphorus-rich particles. 撒哈拉扬起的沙尘暴横跨大西洋，将富含磷的颗粒输送至亚马孙雨林，为其提供养分。
④ 懂 · 选一选
⑤ 今天会说这一句
Rock art in Algeria’s Tassili n’Ajjer shows giraffes and crocodiles—species that vanished when the desert expanded.
⑥ 跟读并录音
Rock art in Algeria’s Tassili n’Ajjer shows giraffes and crocodiles—species that vanished when the desert expanded.
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：Rock art in Algeria’s Tassili n’Ajjer shows giraffes and crocodiles—species that vanished when the desert expanded.
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。