Obedience is the first duty of a soldier. 軍人以服從命令為天職。
　　Observation is the best teacher. 觀察是最好的老師。
　　Offense is the best defense. 進攻是最好的防御。
　　Old friends and old wines are best. 陳酒味醇，老友情深。
　　Old sin makes new shame. 一失足成千古恨。
　　Once a man and twice a child. 一次老，兩次小。
　　Once a thief, always a thief. 偷盜一次，做賊一世。
　　Once and for all. 一勞永逸。
　　Once bitten, twice shy. 一朝被蛇咬, 十年怕井繩。
　　Once in a blue moon. 千載一時。
　　Once in a while; Once too often; Once in a blue moon 有時候;常常;很少
　　One boy is a boy, two boys half a boy, three boys no boy. 一個和尚挑水喝，兩個和尚抬水喝，三個和尚沒水喝。
　　One can not learn a language well unless one works hard. 學(xué)好一種語言非下苦功不可。
　　One cannot be in two places at once. 【諺】我分不開身啊(不幫忙的托辭)。
　　One cannot learn a language well merely by learning its grammatical rules. 光學(xué)文法規(guī)則是學(xué)不好語言的。
　　One cannot live by oneself. 人不能單獨生活。
　　One cannot put back the clock. 時鐘不能倒轉(zhuǎn)。
　　One comes up against examples like these: 我們會遭遇到像這樣的例子： (高三上1)
　　One eyewitness is better than ten hearsays. 百聞不如一見。
　　One false move may lose the game. 一著不慎，滿盤皆輸。
　　One good turn deserves another. 好心有好報;投桃報李。行善積德。
　　One hour today is worth two tomorrow. 爭分奪秒效率高。
　　One man's fault is other man's lesson. 前車之鑒。
　　One never loses anything by politeness. 講禮貌不吃虧。
　　One revolution of the earth around the sun takes a year. 地球繞太陽運行一周需一年時間。
　　One should know oneself. 人應(yīng)了解自己。
　　One should live a worthy life. 人應(yīng)該過著有價值的生活。
　　One should not easily make a promise. 一個人不應(yīng)輕易許下承諾。
　　One should not praise oneself. 人不應(yīng)該稱贊自己。
　　One should respect the teachers. We should respect the teachers. 大家應(yīng)該尊敬老師。
　　One should save (up) for a rainy day. 人應(yīng)該未雨綢繆。
　　One shouldn't overwork oneself. 一個人不應(yīng)該過分勞累。
　　One swallow does not make a summer. 【諺】一燕不成夏;勿以偏概全 (輕率推論易犯錯誤;一關(guān)渡過并非萬事大吉)。
　　One's words reflect one's thinking. 言為心聲。
　　Open? (Are you open now?) 營業(yè)中嗎?
　　Open confession is good for the soul. 【諺】直認(rèn)無諱，身心泰然。
　　Open source is the most interesting way to write software. 開放原始碼是寫軟體最有趣的地方。
　　Opinions are divided on the issue of taxes. 課稅問題，見仁見智。
　　Opinions differ on this matter. 對這件事各人看法不一。
　　Opinions on various social questions differ from person to person. 有關(guān)各種社會問題的意見因人而異。
　　Opportunities Amid the Deflationary Crisis. 通貨緊縮危機中的轉(zhuǎn)機。
　　Opportunity makes the thief. 【諺】有可乘之機才會有賊。
　　Opportunity seldom knocks twice. 【諺】機不可失,時不再來。
　　Other scientists called them Rontgen rays in honor of the man who first found them, but X-ray is the name now
　　always used. 其他的科學(xué)家則稱呼這些射線為?琴射線來紀(jì)念第一個發(fā)現(xiàn)它的人，但X光是現(xiàn)在經(jīng)常使用的名稱。 (高三下3)
　　Other times, other manners. 【諺】時代不同，風(fēng)俗各異。
　　Out of debt, out of danger. 無債一身輕。
　　Out of office, out of danger. 無官一身輕。
　　Out of sight, out of mind.【諺】眼不見，心不想。久離則疏遠。離久情疏。眼不見，心為靜。
　　Out with it! 說出來!
　　Outdoor exercise is no less necessary to good health than nutritious food.
　　戶外運動對身體健康的必要性,不亞於營養(yǎng)食品(對身體健康的必要性)。
　　Outdoor sunlight is very good for the health. 戶外的陽光對健康很有好處。
　　Outside the window it was a wonderful spring morning. 窗外是一片美妙的春天晨景。
　　Oxygen is a kind of gas. 氧氣是一種氣體。(gas)
　　Oxygen is necessary for life. 氧氣是生命所必需的。

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