美国鱼类和野生动物管理局对黄石公园的狼群进行了仔细的监控和管理。
The US Fish and Wildlife Service carefully monitors and manages the wolf packs in Yellowstone.
就在这个时候,美国国家航空航天局决定通过拍摄黄石公园的照片来测试一些新的高空照相机。
Just at this time NASA decided to test some new high-altitude cameras by taking photographs of Yellowstone.
黄石公园野牛群是美国最大的公共的美洲野牛群。
The Yellowstone Park Bison herd is the largest public herd of American Bison in the United States.
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