The biggest obstacle is the ranchers themselves, whose cattle compete with prairie dogs and bison for grass and space.
最大的障碍是牧场主自己，他们的牛与土拨鼠和野牛争夺草地和空间。
The biggest obstacle is the ranchers themselves, whose cattle compete with prairie dogs and bison for grass and space.
最大的障碍是牧场主自己，他们的牛与土拨鼠和野牛争夺草地和空间。
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