The United States is about to mark the 250th anniversary of its founding.
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美国之音中文网
2026-09-23 17:08 · 美国之音中文网 发布了新视频：“伟大的美国州博览会”展示美国历史、文化和创新的精华
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United States Celebrates 250th Anniversary of Its Founding
2026.07.04 · Verified
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