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  1. en.wikipedia.org › wiki › UltravioletUltraviolet - Wikipedia

    2 天前 · Ultraviolet ( UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs, Cherenkov radiation, and ...

  2. 2 天前 · Mercury is the first planet from the Sun and the smallest in the Solar System. In English, it is named after the ancient Roman god Mercurius (Mercury), god of commerce and communication, and the messenger of the gods. Mercury is classified as a terrestrial planet, with roughly the same surface gravity as Mars. The surface of Mercury is heavily ...

  3. en.wikipedia.org › wiki › BambooBamboo - Wikipedia

    2 天前 · In Chinese culture, the bamboo, plum blossom, orchid, and chrysanthemum (often known as méi lán zhú jú 梅蘭竹菊 in Chinese) are collectively referred to as the Four Gentlemen. These four plants also represent the four seasons and, in Confucian ideology, four aspects of the junzi ("prince" or "noble one").

  4. en.wikipedia.org › wiki › South_ParkSouth Park - Wikipedia

    2 天前 · South Park is an American animated sitcom created by Trey Parker and Matt Stone and developed by Brian Graden for Comedy Central. The series revolves around four boys— Stan Marsh, Kyle Broflovski, Eric Cartman, and Kenny McCormick —and their exploits in and around the titular Colorado town. South Park also features many recurring characters.

  5. 1 天前 · The Confederate States of America ( CSA ), commonly referred to as the Confederate States ( C.S. ), the Confederacy, or the South, was an unrecognized breakaway [1] republic in the Southern United States that existed from February 8, 1861, to May 9, 1865. [8] The Confederacy comprised eleven U.S. states that declared secession and warred ...

  6. 1 天前 · James Buchanan Jr. (/bjuːˈkænən/ bew-KAN-ən;[3] April 23, 1791 – June 1, 1868) was an American lawyer, diplomat, and politician. He served as the 15th president of the United States from 1857 to 1861, as the secretary of State from 1845 to 1849, and represented Pennsylvania in both houses of the U.S. Congress. He was an advocate for ...

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