Fourteen wolves were caught in Canada and transported to the Yellowstone.

有十四匹灰狼在加拿大被捕，并被送往黄石公园。

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。

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。

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。

Grey wolves were reintroduced to Yellowstone National Park.

灰狼被重新引入黄石国家公园。