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Marajó Island: Tidal Floodplain at the Amazon Delta Apex
马拉若岛：亚马逊河口三角洲顶端的潮汐泛滥平原
精读先不看文字，完整听一遍。
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Marajó Island, larger than Switzerland, sits at the Amazon River’s tidal apex where freshwater meets Atlantic saltwater.马拉若岛面积大于瑞士，位于亚马孙河潮汐顶点，淡水与大西洋咸水在此交汇。
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Its low-lying surface floods seasonally up to four meters deep, creating vast floating meadows and várzea forests.地势低洼的地表每年季节性淹没，水深可达四米，形成广阔的浮草甸和洪泛森林（瓦泽亚林）。
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Tidal bores travel up distributary channels twice daily, reshaping mudflats and dispersing nutrient-rich sediments.潮涌每日两次沿分流河道上溯，重塑泥滩并扩散富含养分的沉积物。
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Unlike typical deltas, Marajó lacks prominent sandy lobes because fine clays dominate its suspended load.与典型三角洲不同，马拉若岛缺乏显著的沙质叶瓣，因其悬浮载荷以细黏土为主。
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Indigenous communities cultivate cassava and raise water buffalo on seasonally exposed grasslands called campos.原住民社区在季节性出露的草原（坎波斯）上种植木薯、饲养水牛。
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Mangroves fringe only narrow coastal strips, as strong river discharge suppresses marine vegetation inland.红树林仅分布于狭窄的沿海地带，因强劲的河流径流抑制了内陆海洋植被生长。
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Satellite imagery reveals shifting channel networks that reorganize annually under flood-pulse dynamics.卫星影像显示，河道网络随洪水脉冲动态年年更迭重组。
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Subsurface peat layers store carbon despite frequent inundation, challenging assumptions about wetland carbon permanence.尽管频繁被淹，地下泥炭层仍能固碳，挑战了湿地碳储存持久性的传统认知。
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Prevailing easterly winds push seawater westward, enhancing tidal range and mixing in this macrotidal estuary.盛行东风将海水向西推移，增强了这一大潮河口的潮差与水体混合。
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Marajó illustrates how fluvial discharge magnitude, tidal energy, and sediment type co-determine delta morphology.马拉若岛揭示了河流径流量、潮汐能量与沉积物类型如何共同决定三角洲形态。
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
- Satellite imagery reveals shifting channel networks that reorganize annually under flood-pulse dynamics. 卫星影像显示，河道网络随洪水脉冲动态年年更迭重组。
- Tidal bores travel up distributary channels twice daily, reshaping mudflats and dispersing nutrient-rich sediments. 潮涌每日两次沿分流河道上溯，重塑泥滩并扩散富含养分的沉积物。
- Indigenous communities cultivate cassava and raise water buffalo on seasonally exposed grasslands called campos. 原住民社区在季节性出露的草原（坎波斯）上种植木薯、饲养水牛。
④ 懂 · 选一选
⑤ 今天会说这一句
Satellite imagery reveals shifting channel networks that reorganize annually under flood-pulse dynamics.
⑥ 跟读并录音
Satellite imagery reveals shifting channel networks that reorganize annually under flood-pulse dynamics.
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：Satellite imagery reveals shifting channel networks that reorganize annually under flood-pulse dynamics.
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。