In early 2009 the U.S.National Park Service added the Nottingham Park Serpentine Barrens in Pennsylvania to its list of National Natural Landmarks.是什么意思_In early 2009 the U.S.National Park Service added the Nottingham Park Serpentine Barrens in Pennsylvania to its list of National Natural Landmarks.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句