|  |  | Orwell (name)  /  George Orwell (1903-1950), British novelist, author of Animal Farm 動物農場|动物农场  and 1984 一九八四年 |  | 
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|  |  | marvelous  / mysterious  / profound  / marvel  / wonder  |  | 
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|  |  | Aldous Huxley (1894–1963), British novelist and author of "Brave New World" 美麗新世界|美丽新世界 |  | 
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|  |  | Olympic Games; the Olympics  |  | 
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|  |  |  | HSK 7-9 | 
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|  |  | secret  / mystery  | HSK 7-9 | 
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|  |  | Audi  |  | 
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|  |  | Ultraman, Japanese science fiction superhero  |  | 
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|  |  | Olympic  |  | 
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|  |  | Ossetia (ethnolinguistic region in the Caucasus Mountains)  |  | 
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|  |  | Barack Obama (1961–), US Democrat politician, president 2009–2017  |  | 
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|  |  | outlets (loanword)  / retail outlet (e.g. specializing in seconds of famous brands)  / factory outlet retail store  |  | 
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|  |  | Olympic Village  |  | 
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|  |  | Austro-Hungarian Empire 1867–1918  |  | 
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|  |  | Homer's Odyssey  |  | 
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|  |  | an Academy Award; an Oscar  |  | 
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|  |  | olympiad mathematics  / competition math  |  | 
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|  |  | Olympic Stadium  |  | 
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|  |  | Ottoman (empire)  |  | 
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|  |  | Olympic Games  |  | 
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|  |  | Oreo cookies  |  | 
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|  |  | Occam's razor  |  | 
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|  |  | Olympia (Greece)  |  | 
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|  |  | Otto  |  | 
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|  |  | Austin or Austen (name)  / Austin, Texas  |  | 
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|  |  | omicron (Greek letter Ο, ο)  |  | 
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|  |  | Ordovician system (geology)  |  | 
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|  |  | Auschwitz concentration camp  |  | 
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|  |  | Austria  |  | 
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|  |  | Aubrey (name)  |  | 
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|  |  | O'Connell (name)  / Daniel O'Connell (1775-1847), Irish nationalist and catholic activist  |  | 
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|  |  | Olympic Organizing Committee (abbr. to 奧組委|奥组委 )  |  | 
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|  |  | Austria  |  | 
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|  |  | (film industry) Oscar (Academy Award)  / CL: 屆|届 /  (name) Oscar  |  | 
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|  |  | Olympus, Japanese manufacturer of cameras and optical instruments  |  | 
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|  |  | Aurelia, a hypothetical planet  |  | 
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|  |  | Omaha  |  | 
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|  |  | Orléans  |  | 
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|  |  | Onassis (name)  / Aristotle Onassis (1906-1975), Greek shipping magnate  |  | 
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|  |  | Strait of Otranto between the heel of Italy and Albania  |  | 
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|  |  | Austin or Austen (name)  /  Austin, Texas  /  also written 奧斯汀|奥斯汀 |  | 
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|  |  | Oudin coil  / Oudin resonator  |  | 
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|  |  | (neologism c. 2020) come on, you can do it!  |  | 
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|  |  | Augusta (place name: capital of Maine, city in Georgia etc)  |  | 
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|  |  | Oswald  |  | 
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|  |  | Auschwitz (concentration camp)  |  | 
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|  |  | ʻOumuamua (interstellar object)  |  | 
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|  |  | Augustus (name)  |  | 
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|  |  | Ottoman Empire (1299–1922)  |  | 
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|  |  | Omar (Arabic name)  |  | 
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|  |  | Oklahoma, US state (Tw)  |  | 
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|  |  | Auschwitz (concentration camp)  |  | 
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|  |  | Orlando  |  | 
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|  |  | Albany, New York  |  | 
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|  |  | Olympic committee  |  | 
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|  |  | (metallurgy) austenite; austenitic  |  | 
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|  |  | Orion (NASA spacecraft)  |  | 
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|  |  | Othello (play by Shakespeare)  |  | 
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|  |  | ao dai (traditional Vietnamese garment)  |  | 
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|  |  | Odin (god in Norse mythology)  |  | 
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|  |  | Åland Islands, Finland  |  | 
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|  |  | (loanword) oseltamivir  |  | 
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|  |  | (bound form) Austria (abbr. for 奧地利|奥地利 )  /  (bound form) Olympics (abbr. for 奧林匹克|奥林匹克 )  |  | 
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|  |  | obscure  / mysterious  |  | 
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|  |  | omega (Greek letter Ω, ω)  / also pr. [ao4mi3jia1]  |  | 
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|  |  | Odysseus  |  | 
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|  |  | Aarhus, city in Denmark  |  | 
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|  |  | Osh (city in Kyrgyzstan)  |  | 
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|  |  | Opole, city in Poland  |  | 
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|  |  | Oviedo (Asturian: Uviéu), capital of Asturias in northwest Spain  |  | 
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|  |  | Oklahoma, US state (Tw)  |  | 
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|  |  | Oceanus, a Titan in Greek mythology  |  | 
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|  |  | Oxus River  /  alternative name for Amu Darya 阿姆河 |  | 
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|  |  | O'Connor (name)  / Thomas Power O'Connor (1848-1929), Irish journalist and nationalist political leader  |  | 
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|  |  | Oceanus, a Titan in Greek mythology  |  | 
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|  |  | Odisha (formerly Orissa), eastern Indian state  |  | 
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|  |  | Oulu (city in Finland)  |  | 
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|  |  | Olivia (name)  |  | 
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|  |  | (Tw) (coll.) troublesome customer; obnoxious guest (from Taiwanese 漚客 , Tai-lo pr. [àu-kheh])  |  | 
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|  |  | Holy mystery  / Holy sacrament (of Orthodox church)  |  | 
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|  |  | Ordovician (geological period 495-440m years ago)  |  | 
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|  |  | hidden ally  / powerful support  / support  / backup  |  | 
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|  |  | François Hollande (1954-), French Socialist politician, president of France 2012-2017  |  | 
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|  |  | Alderney (Channel Islands)  |  | 
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|  |  | Aum Shinrikyo (or Supreme Truth), the Japanese death cult responsible for the 1995 sarin gas attack on the Tokyo subway  |  | 
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|  |  | Odysseus, hero of Homer's Odyssey  |  | 
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|  |  | Auckland (New Zealand city)  / Oakland (California, US city)  |  | 
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|  |  | Madeleine Albright (1937–2022), US Secretary of State 1997–2001  |  | 
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|  |  | Audrey  |  | 
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|  |  | Oranjestad, capital of Aruba  |  | 
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|  |  | Nikolai Ostrovsky (1904-1936), Soviet socialist realist writer  / Alexander Ostrovsky (1823-1886), Russian playwright  |  | 
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|  |  | Orion (constellation, loan word)  /  also written 獵戶座|猎户座 |  | 
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|  |  | Oslo, capital of Norway  |  | 
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|  |  | Otranto city on the southeast heel of Italy  |  | 
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