世界地理与人文·英语30篇（2）

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奥卡万戈三角洲：无出海口的内陆三角洲

Unlike most deltas, the Okavango flows into the Kalahari Desert rather than reaching any sea or ocean.
Seasonal floods from Angola’s highlands travel over 1,000 kilometers before spreading across Botswana’s flat interior.
Evaporation and plant transpiration consume over 95% of incoming water, leaving no downstream outflow.
Channels bifurcate and silt up regularly, causing shifting island formations and localized wetland expansion.
Papyrus and acacia woodlands occupy drier levees, while permanent swamps host hippos and sitatungas.
Groundwater recharge occurs mainly beneath sandy islands, creating isolated freshwater lenses in arid surroundings.
Fire regimes interact with flooding cycles to maintain mosaic vegetation patterns across the delta plain.
Local communities navigate by canoe through ephemeral waterways whose positions change yearly.
Satellite time-series reveal how flood extent contracts during regional droughts but rebounds quickly when rains return.
This self-contained system demonstrates how hydrology, geomorphology, and ecology co-evolve in closed continental basins.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Local communities navigate by canoe through ephemeral waterways whose positions change yearly. 当地居民依靠独木舟穿行于位置年年变化的季节性水道。
Evaporation and plant transpiration consume over 95% of incoming water, leaving no downstream outflow. 蒸发与植物蒸腾消耗了95%以上的入流水量，下游无径流排出。
Channels bifurcate and silt up regularly, causing shifting island formations and localized wetland expansion. 河道频繁分汊与淤塞，导致岛屿位置不断变化，局部湿地随之扩张。

这篇中文题目最接近哪一句？奥卡万戈三角洲：无出海口的内陆三角洲一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？与多数三角洲不同，奥卡万戈河并未注入任何海洋，而是流入卡拉哈里沙漠。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） Okavango Delta: Inland Delta Without an Outlet How to cook noodles A maths worksheet

Local communities navigate by canoe through ephemeral waterways whose positions change yearly.

Local communities navigate by canoe through ephemeral waterways whose positions change yearly.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Local communities navigate by canoe through ephemeral waterways whose positions change yearly.