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百科全书文章始于字母 O

1. O Canada
   (啊，加拿大)
2. O'Hare International Airport
   (奥黑尔国际机场)
3. O'Higgins Region
   (奥伊金斯将军解放者大区)
4. O. Henry
   (O.亨利)
5. Oahu
   (歐胡島)
6. Oak
   (栎属)
7. Oakland Alameda Coliseum
   (奥克兰阿拉米达竞技场)
8. Oakland Raiders
   (奥克兰突袭者队)
9. Oakwell
   (奥克韦尔)
10. Oasis discography
    (綠洲樂隊作品列表)
11. Oath
    (宣誓)
12. Oba Chandler
    (Oba Chandler)
13. Obazoa
    (奥巴佐亚)
14. Oberallgäu
    (上阿尔戈尔州)
15. Obergefell v. Hodges
    (欧伯吉菲尔诉霍奇斯案)
16. Obergefell v. Hodges
    (欧伯吉菲尔诉霍奇斯案)
17. Oberon (moon)
    (天卫四)
18. Oberstdorf
    (奥伯斯多夫)
19. Obesity
    (肥胖症)
20. Object
    (对象)
21. Object (grammar)
    (賓語)
22. Object-oriented programming
    (面向对象程序设计)
23. Objectivism
    (客观主义)
24. Objectivism (Ayn Rand)
    (客觀主義)
25. Objectivity
    (客观性)
26. Objectivity (journalism)
    (客观性(新闻学))
27. Oblast
    (州 (斯拉夫))
28. Oblate spheroid
    (扁椭球体)
29. Oblique order
    (倾斜的顺序)
30. Oblique type
    (斜线型)
31. Oboe
    (雙簧管)
32. Observable universe
    (可觀測宇宙)
33. Observation
    (观察)
34. Obsessive–compulsive disorder
    (强迫症)
35. Obstacle course
    (障碍赛 )
36. Occidental College
    (西方學院)
37. Occitanie
    (奥克西坦尼)
38. Occult
    (神秘主义)
39. Occupation
    (佔領)
40. Occupation of Czechoslovakia by Nazi Germany
    (纳粹德国对捷克斯洛伐克的占领)
41. Occupational Safety and Health
    (職業安全)
42. Ocean
    (洋)
43. Ocean gyre
    (大洋涡旋)
44. Ocean surface wave
    (海洋表面波)
45. Ocean thermal energy conversion
    (海水溫差發電)
46. Ocean's Twelve
    (海洋十二号)
47. Oceanic climate
    (海洋性气候)
48. Oceanic trench
    (海沟)
49. Ocelot
    (虎貓)
50. Ocicat
    (奥西卡)
51. Octal
    (八进制)
52. Octave
    (八度)
53. October
    (10月)
54. Octocorallia
    (八放珊瑚亞綱)
55. Octopus
    (章鱼属)
56. Odawa
    (渥太華人)
57. Odenwald
    (歐登瓦德山)
58. Oder River
    (奧得河)
59. Odilon Redon
    (奥迪隆·雷东)
60. Odin
    (奥丁)
61. Odontoceti
    (齿鲸类)
62. Odontochelys
    (半甲齒龜)
63. Odyssey
    (奥德赛)
64. OECD
    (经济合作与发展组织)
65. Oestradiol
    (雌二醇)
66. Of Mice and Men
    (人鼠之間)
67. Ofanto
    (奥凡托河)
68. Off-site data protection
    (场外数据保护)
69. Offa's Dyke
    (奥法堤)
70. Office suite
    (办公套件)
71. Official residence
    (官邸)
72. Official U.S. PlayStation Magazine
    (官方美国PlayStation杂志)
73. Offside rule
    (越位 (足球))
74. Ofra Haza
    (Ofra Haza)
75. Ogdoad
    (八元神)
76. Ogdoad (Egyptian)
    (奥格达德)
77. OGPU
    (国家政治保卫总局)
78. Ogyū Sorai
    (荻生徂徠)
79. Ohio Senate
    (俄亥俄州参议院)
80. Ohio Valley Conference
    (俄亥俄山谷会议)
81. Ohio Valley Wrestling
    (俄亥俄河谷摔跤协会)
82. Ohm's law
    (欧姆定律)
83. Oil
    (油)
84. Oil paint
    (油漆)
85. Oil sands
    (油砂)
86. Ojibwe
    (欧及布威族)
87. Okefenokee Swamp
    (Okefenokee沼泽)
88. Okinawa
    (沖繩島)
89. Okinawa Prefecture
    (冲绳县)
90. Oklahoma
    (奧克拉荷馬州)
91. Okroshka
    (俄羅斯凍湯)
92. Oksana Baiul
    (Oksana Baiul)
93. Oksana Grishuk
    (Oksana Grishuk)
94. Old Kingdom of Egypt
    (古王國時期)
95. Old Melbourne Gaol
    (墨尔本旧监狱)
96. Old North Church
    (老北教堂)
97. Old Style and New Style dates
    (旧式和新式日期)
98. Old Synagogue (Erfurt)
    (老犹太教堂（埃尔富特）)
99. Old Testament
    (旧约圣经)
100. Old-growth forest
     (原始森林)
101. Oldest dated rocks
     (年代最久远 )
102. Oldham
     (奧爾德姆)
103. Olduvai Gorge
     (奥杜瓦伊峡谷)
104. Olea capensis
     (油菜)
105. Olfaction
     (嗅觉)
106. Olfactory bulb
     (嗅觉球)
107. Olfactory system
     (嗅覺系統)
108. Oligopoly
     (寡头垄断)
109. Olive (color)
     (橄榄色)
110. Olive tree
     (橄榄树)
111. Oliver & Company
     (奥丽华历险记)
112. Oliver Cromwell
     (奥利弗-克伦威尔)
113. Oliver Goldsmith
     (奧立佛·高德史密斯)
114. Oliver Heaviside
     (奧利弗·黑維塞)
115. Oliver Postgate
     (Oliver Postgate)
116. Oliver Smithies
     (Oliver Smithies)
117. Oliver Wallace
     (奥利弗-华莱士)
118. Olivia Colman
     (Olivia Colman)
119. Olly Murs
     (奥利-穆尔斯)
120. Olof Palme
     (奥洛夫-帕尔梅)
121. Olympic Games
     (奥林匹克运动会)
122. Om Puri
     (Om Puri)
123. Om Shanti Om
     (奥姆-香提-奥姆)
124. Omagh
     (奧馬)
125. Omar Sharif
     (奥马尔-谢里夫)
126. Omega Centauri
     (半人马座ω)
127. OMG (song)
     (OMG(歌曲))
128. Omnivore
     (杂食性动物)
129. On the Floor
     (在地板上)
130. On the Origin of Species
     (论物种的起源)
131. On the Road
     (在路上)
132. Onam
     (奥纳姆节)
133. Once Upon a Time in Mexico
     (墨西哥往事)
134. Oncogene
     (癌基因)
135. One Direction
     (1世代)
136. One Hot Minute
     (一分钟热度)
137. One Piece
     (一件事)
138. One Unit Policy
     (一个单位的政策)
139. One-inch boy
     (一寸法師)
140. One-party state
     (一党制)
141. One-Two-GO Airlines Flight 269
     (一二八航空公司269号航班)
142. Online Mendelian Inheritance in Man
     (人的在线孟德尔遗传)
143. Online shopping
     (网络购物)
144. Only Connect
     (只有连接)
145. Oobi
     (小手乌比)
146. Oodgeroo Noonuccal
     (Oodgeroo Noonuccal)
147. Oomycete
     (卵菌綱)
148. Oort cloud
     (奥尔特云)
149. Op art
     (欧普艺术)
150. Opcode
     (操作码)
151. OPEC
     (石油输出国组织)
152. Opel
     (欧宝)
153. Open All Hours
     (全天候开放)
154. Open bolt
     (打开门闩)
155. Open class
     (公开课)
156. Open content
     (開放內容)
157. Open Season (movie series)
     (开放的季节（电影系列）)
158. Open Season (movie)
     (开放的季节(电影))
159. Open Season 2
     (开放季2)
160. Open Season 3
     (打獵季節3)
161. Open star cluster
     (疏散星团)
162. Open University
     (開放大學)
163. Openair Frauenfeld
     (开放性的Frauenfeld)
164. OpenBSD
     (OpenBSD)
165. OpenOffice
     (OpenOffice)
166. OpenOffice
     (Apache OpenOffice)
167. OpenOffice Base
     (OpenOffice.org Base)
168. OpenOffice Draw
     (开放式办公室绘图)
169. OpenOffice Impress
     (OpenOffice.org Impress)
170. OpenOffice Writer
     (OpenOffice Writer)
171. OpenVMS
     (OpenVMS)
172. OpenVPN
     (OpenVPN)
173. Opera buffa
     (喜歌剧)
174. Opera house
     (歌劇院)
175. Opera seria
     (正歌剧)
176. Opéra-Comique
     (喜歌劇院)
177. Operant conditioning
     (操作制約)
178. Operating system
     (操作系统)
179. Operation Barbarossa
     (巴巴羅薩行動)
180. Operation Entebbe
     (恩德培行动)
181. Operation Overlord
     (霸王行动)
182. Operation Restore Hope
     (恢复希望行动)
183. Operation Uphold Democracy
     (维护民主行动)
184. Operation Yewtree
     (耀武扬威行动)
185. Operations and Checkout Building
     (业务和结账楼)
186. Operetta
     (轻歌剧)
187. Opeth
     (殘月魔都)
188. Ophelia (moon)
     (奥菲利亚(月亮))
189. Ophiolite
     (奥菲利特岩)
190. Ophthalmosauridae
     (大眼魚龍科)
191. Ophthalmosaurus
     (大眼魚龍屬)
192. Opioid
     (鴉片類藥物)
193. Opium poppy
     (罌粟)
194. Opium Wars
     (鸦片战争)
195. Oppidum
     (奥皮杜姆)
196. Oppression
     (压迫)
197. Opsin
     (视蛋白)
198. Optic tectum
     (视网膜)
199. Optical fiber
     (光纤)
200. Optical illusion
     (視錯覺)
201. Optical printer
     (光学打印机)
202. Opus Dei
     (主业会)
203. Opus number
     (作品号)
204. Oracle Corporation
     (甲骨文公司)
205. Oracle of Delphi
     (德尔斐神谕)
206. Oradea
     (奥拉迪亚)
207. Oral rehydration therapy
     (口服补液疗法)
208. Orange
     (橙色)
209. Orange (fruit)
     (橙)
210. Orange County, California
     (橙縣 (加利福尼亞州))
211. Orange County, California
     (橙县)
212. Orange County, Virginia
     (弗吉尼亚州奥兰治县)
213. Orange County, Virginia
     (弗吉尼亚州奥兰治县)
214. Orange Is the New Black
     (勁爆女子監獄)
215. Orange Walk District
     (奥兰治沃克区)
216. Orator
     (演说家)
217. Oratorio
     (神劇)
218. Orbit
     (轨道 (力学))
219. Orbital forcing
     (轨道强迫)
220. Orbital resonance
     (轨道共振)
221. Orchestra
     (乐队)
222. Orchestration
     (配器法)
223. Orchid
     (蘭科)
224. Order of Merit
     (荣誉勋章)
225. Order of Merit of the Italian Republic
     (意大利共和国荣誉勋章)
226. Order of operations
     (運算次序)
227. Order of the Companions of Honour
     (名譽勳位)
228. Order of the Indian Empire
     (印度帝國勳章)
229. Order of the Phoenix
     (凤凰勋章)
230. Order of the Star of India
     (印度之星勋章)
231. Order of the Thistle
     (薊花勳章)
232. Ordnance Survey National Grid
     (英國國家格網參考系統)
233. Ordo Templi Orientis
     (东方圣教)
234. Ordovician
     (奥陶纪)
235. Ore Mountains
     (厄尔士山脉)
236. Oregon Territory
     (俄勒岡領地)
237. Oregon Trail
     (俄勒冈小道)
238. Organelle
     (细胞器)
239. Organic chemistry
     (有机化学)
240. Organic matter
     (有機物質)
241. Organisation internationale de la Francophonie
     (法语国家国际组织)
242. Organism
     (生物)
243. Orgasm
     (性高潮)
244. Orhan Pamuk
     (Orhan Pamuk)
245. Oriana Fallaci
     (奥里亚娜·法拉奇)
246. Origami
     (折纸)
247. Origen
     (俄利根)
248. Origin of life
     (生命起源)
249. Origins of the blues
     (蓝调的起源)
250. Orinoco
     (奥里诺科河)
251. Oriole
     (黄鹂科)
252. Orion (constellation)
     (獵戶座)
253. Orion (spacecraft)
     (猎户座(航天器))
254. Orion Arm
     (獵戶臂)
255. Orion complex
     (獵戶座分子雲團)
256. Orion nebula
     (猎户座星云)
257. Orion Pictures
     (Orion Pictures)
258. Orkney Islands
     (奥克尼群岛)
259. Orlande de Lassus
     (Orlande de Lassus)
260. Orlando Bloom
     (奥兰多-布鲁姆)
261. Ornamentation (music)
     (裝飾音)
262. Ornithischia
     (鳥臀目)
263. Ornithomimidae
     (似鳥龍科)
264. Ornithomimus
     (鸟类)
265. Ornithopod
     (鳥腳亞目)
266. Orogeny
     (造山運動)
267. Orphan Black
     (黑色孤儿)
268. Orpiment
     (橙子)
269. Orquesta Sinfónica Simón Bolívar
     (西蒙-玻利瓦尔交响乐团（Orquesta Sinfónica Simón Bolívar)
270. Orrery
     (珊瑚礁)
271. Orson Scott Card
     (Orson Scott Card)
272. Orthodox
     (正统派)
273. Orthographic depth
     (正字法深度)
274. Orthography
     (正字法)
275. Orthomyxoviridae
     (正黏液病毒科（Orthomyxoviridae)
276. Orthoptera
     (直翅目)
277. Orthosie (moon)
     (木卫三十五)
278. Orto botanico di Pisa
     (比薩植物園)
279. OS X El Capitan
     (OS X El Capitan)
280. Osage Nation
     (奧塞奇族)
281. Osaka
     (大阪)
282. Osaka Castle
     (大阪城)
283. Osama bin Laden
     (奥萨马-本-拉登)
284. Oscar B. Cintas
     (奥斯卡-B-辛塔斯)
285. Oscar Hertwig
     (奥斯卡-赫特维格)
286. Oscar Pistorius
     (奥斯卡皮斯托瑞斯)
287. Osip Mandelstam
     (奥西普·曼德尔施塔姆)
288. Osiris
     (俄西里斯)
289. Oskar Heinroth
     (奧斯卡·海因洛特)
290. Oskar Kokoschka
     (Oskar Kokoschka)
291. Oskar Sundqvist
     (Oskar Sundqvist)
292. Osmosis
     (渗透)
293. Osnabrück (district)
     (奥斯纳布吕克（区）)
294. Ostallgäu
     (奥斯塔尔豪省（Ostallgäu)
295. Osteogenesis Imperfecta
     (成骨不全症)
296. Osteology
     (骨骼学)
297. Ostinato
     (固定音型)
298. Ostracod
     (介形綱)
299. Oswald (TV series)
     (奥斯瓦尔德（电视系列）)
300. Oswald Avery
     (奥斯瓦尔德-艾利)