手拿锄头和斧子，他们精心的建造出自己的平地，梯田，和简单的水处理系统，这样可以保持住最肥沃的表层土不要流失。
With hoes and axes, they crafted flat, wide terraces and a simple water-management system that would keep valuable topsoil in place.
建造梯田湿地和陂塘系统，以削减洪峰流量，调节季节性雨水。
Terraced wetlands and retention ponds were created to reduce peak water flow and regulate the seasonal rainwater.
庞大的灌溉系统是红河流域梯田农业的基石，也是红河流域农业文明的重要标志。
The colossal irrigation system is not just the footstone of the terrace agriculture, but also is the symbol of the agricultural civilization in the reaches of Red River.
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