A vast grassland region of central North America extending from the Canadian provinces of Alberta, Saskatchewan, and Manitoba southward to Texas. Much of the area is used for cattle and wheat ranching.大草原，大平原：北美中部广阔的草原地带，从加拿大亚伯达、萨斯喀彻温、马尼托巴诸省南延伸至美国得克萨斯州。其大片土地用做饲养牛群和种植小麦