Have you been to the prairies in North America?
你去过北美洲的大草原吗？
The prairies are vast stretches of nearly level land.
这些大草原是一大片一大片较为平坦的土地。
The soil of the Illinois prairies is fat, rich and thick.
伊利诺伊大草原上，土壤肥沃、丰产而深厚。
This is how the prairies were built, the relationship between bison and grasses.
这也是草原的形成原理，野牛和草类的关系。
This is how the prairies were built, the relationship between bison and grasses.
这也是草原的形成原理，野牛和草类的关系。
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