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4 天前 · Poliomyelitis (/ ˌ p oʊ l i oʊ ˌ m aɪ ə ˈ l aɪ t ɪ s / POH-lee-oh-MY-ə-LY-tiss), commonly shortened to polio, is an infectious disease caused by the poliovirus. Approximately 75% of cases are asymptomatic; mild symptoms which can occur include sore throat and fever; in a proportion of cases more severe symptoms develop such as headache, neck stiffness, and paresthesia.
3 天前 · Ernest Miller Hemingway ( / ˈɜːrnɪst ˈhɛmɪŋweɪ /; July 21, 1899 – July 2, 1961) was an American novelist, short-story writer and journalist. Best known for an economical, understated style that significantly influenced later 20th-century writers, he is often romanticized for his adventurous lifestyle, and outspoken and blunt public ...
5 天前 · Kentucky (1908) Brown v. Board of Education of Topeka, 347 U.S. 483 (1954), [1] was a landmark decision of the U.S. Supreme Court ruling that U.S. state laws establishing racial segregation in public schools are unconstitutional, even if the segregated schools are otherwise equal in quality. The decision partially overruled the Court's 1896 ...
4 天前 · Marco Polo (/ ˈ m ɑːr k oʊ ˈ p oʊ l oʊ / , Venetian: [ˈmaɾko ˈpolo], Italian: [ˈmarko ˈpɔːlo] ; c. 1254 – 8 January 1324) was a Venetian merchant, explorer and writer who travelled through Asia along the Silk Road between 1271 and 1295. His travels are recorded in The Travels of Marco Polo (also known as Book of the Marvels of the World and Il Milione, c. 1300), a book that ...
2 天前 · Seoul, officially Seoul Special City, is the capital of the Republic of Korea (ROK), commonly known as South Korea, and the country's most populous urban area. The broader Seoul Capital Area, encompassing Gyeonggi province and Incheon metropolitan city, emerged as the world's fourth largest metropolitan economy in 2014, trailing only Tokyo, New York City, and Los Angeles, hosting more than ...
2024年5月23日 · Structure of a typical L-alpha-amino acid in the "neutral" form Amino acids are organic compounds that contain both amino and carboxylic acid functional groups.[1] Although over 500 amino acids exist in nature, by far the most important are the 22 α-amino acids incorporated into proteins.[2] Only these 22 appear in the genetic code of life.[3 ...
4 天前 · Language is a structured system of communication that consists of grammar and vocabulary. It is the primary means by which humans convey meaning, both in spoken and written forms, and may also be conveyed through sign languages. Human language is characterized by its cultural and historical diversity, with significant variations observed ...
