1·Grey wolves were reintroduced to Yellowstone National Park.
灰狼被重新引入黄石国家公园。
2·The next day we're at Yellowstone National Park, where we have a picnic.
第二天，我们在黄石公园进行了野餐。
3·By the 1920s, wolves had practically disappeared from the Yellowstone area.
到20世纪20年代，黄石地区的狼几乎都消失了。
4·After years of heated debate, gray wolves were reintroduced to Yellowstone National Park.
经过多年的激烈争论，灰狼被重新引入黄石国家公园。
5·The US Fish and Wildlife Service carefully monitors and manages the wolf packs in Yellowstone.
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。
1·Yellowstone obviously was of this second type, but Christiansen couldn't find the caldera anywhere.
黄石公园显然属于第二种类型，但是克里斯蒂安森就是找不到这个火山口。
2·Just at this time NASA decided to test some new high-altitude cameras by taking photographs of 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。
3·It paints summer skies as well, and can occur as far south as Yellowstone.
它同样出现在夏天，甚至出现在远至南方的黄石公园。
4·Yellowstone is at the northeastern end of the Snake River Plain, a great U-shaped arc through the mountains that extends from Boise, Idaho some 400 miles (640 km) to the west.
黄石公园是在蛇河平原的东北端。蛇河平原是一个巨大的U弧形，由爱达荷州的博伊西山脉向外延伸出来的群山向西大约400英里(640公里)。
5·Yellowstone has numerous recreational opportunities, including hiking, camping, boating, fishing and sightseeing.
黄石公园有许多娱乐机会，包括徒步旅行，露营，划船，钓鱼以及游览。