The National Trust for Historic Preservation today announced its list of America's 11 Most Endangered Historic Places for 2009.

美国国家历史建筑保护信托会今天公布2009年度11个濒临毁灭的历史遗迹。

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In general, a building needs to be at least 50 years old before it can be added to the National Register of Historic Places.

一般来说，要被列入“国家史迹名录”，一栋建筑至少要有50年历史。

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In 1994, the structure was deemed a historic landmark, and in 2005 it was on the national register of historic places.

1994年，该建筑被认为是现代主义建筑史上的里程碑，并于2005年登记成国家历史名胜。

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Eleven years later, it was added to the National Registry of Historic Places by the state and the U.S. National Park Service.

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Earlier this year, park officials also closed access to the historic Barker Dam, which is listed on the National Register of Historic Places, after vandals scrawled a series of writings on the landmark wall.

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Three years later, it was placed on the National Register of Historic Places.

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