濒危物种不再濒危？

Gray wolves, a species that has long been vilified and admired, will no longer receive federal protections under the Endangered Species Act in the Lower 48 U.S. states, the Trump administration announced Thursday.

川普政府周四宣布，在美国本土48个州，长期以来一直受到人们的诋毁或赞赏的灰狼将不再受到《濒危物种法案》的联邦保护。

The long-anticipated move is drawing praise from those who want to see the iconic species managed by state and tribal governments, and harsh criticism from those who believe federal protections should remain in place until wolves inhabit more of their historical range.

这项期待已久的举措得到了那些希望看到州政府和部落政府管理这一标志性物种的人的赞扬，同时也遭到了那些认为在狼的栖息地恢复到历史水平之前，联邦政府应该继续保护它们的人的严厉批评。

Gray wolves used to exist across most of North America.

灰狼曾经遍布生活在北美大部分地区。

"After more than 45 years as a listed species, the gray wolf has exceeded all conservation goals for recovery," said Interior Secretary David Bernhardt, announcing the delisting, which will revert management of wolf populations to local wildlife agencies.

“灰狼被列为濒危物种45年之后，已经超出了之前设立的所有保育目标。”内政部长大卫·伯恩哈特在宣布将灰狼从濒危物种名单中删除时说。

Federal wildlife officials are hailing the move as a success story, similar to endangered species recovery stories such as the bald eagle and American alligator.

联邦野生动物官员称赞此举是一个成功的故事，类似于濒危物种恢复的故事还有秃鹰和美洲鳄。

After being nearly wiped clean from the contiguous U.S. by the mid-20th century, there are now more than 6,000 gray wolves in the Lower 48 states, largely clustered in the Northern Rocky Mountains and the Western Great Lakes region.

到20世纪中期，灰狼几乎在美国本土灭绝，而现在美国本土48个州有6000多只灰狼，它们大多聚集在北部的落基山脉和西部的大湖地区。

问题

文中提到灰狼被列为保护动物有多少年了？

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