The Yellowstone wolf project has been a valuable experiment to help biologists decide whether to reintroduce wolves to other parts of the country as well.
黄石国家公园狼计划是一项有价值的实验，有助于生物学家决定是否将狼重新引入美国其他地区。
The Yellowstone wolf project has been a valuable experiment to help biologists decide whether to reintroduce wolves to other parts of the country as well.
黄石国家公园狼计划是一项有价值的实验，有助于生物学家决定是否将狼重新引入美国其他地区。
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