牧民们向南迁移，沿着主要河流系统进入热带草原地区。
The herders shifted south, following the major river systems into savanna regions.
当一条河在平原地带形成了一个圈圈，侵蚀会造成互相挨得很近的两个河岸最终连在一起，使得河流有一条捷径。
When a river forms a loop on flat terrain, undercutting occurring on the riverbanks closest to each other can eventually connect the Banks, giving the river a shortcut.
长江中下游平原地势低平，河流和湖泊星罗棋布，是中国主要的水稻、淡水鱼产区，素称? 鱼米之乡?
The Middle-Lower Yangtze Plain's many lakes and rivers make it particularly suitable for paddy rice and freshwater fish, hence its designation of "land of fish and rice."
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