十五、以O(shè)開頭的核心詞匯
    objective 目的，宗旨 political ～s
    oblige 強(qiáng)迫，迫使 In certain countries the law ～s parents to send their children to school
    obscure 晦澀的，費(fèi)解的 an ～ text
    obsolete 廢棄的，淘汰的 Wooden warships are ～.
    obstinate 頑固的，固執(zhí)的，倔強(qiáng)的The girl would go her own way, in spite of all warnings
    occasion 時(shí)刻，場(chǎng)合They met on three ～s
    occupy 占用，占有My books ～ a lot of space
    occur 發(fā)生，存在，出現(xiàn) when did the earthquake ～?
    odd的奇數(shù)的，單的，奇怪的One ,three five are ～numbers
    offend 冒犯，使生氣 She was afraid of ～ing anyone.
    offence 犯法行為，過錯(cuò) They were arrested for drug ～s.
    offset 補(bǔ)償，抵消They gains ～the losses.
    omit 省略，刪去 Minor points may be omitted.
    opaque 不透明的A brick wall is ～.
    option 選擇權(quán) It is your ～ to take it or leave it
    orient 東方，東方國家 political theory in the West and in the Orient
    origin 起源，由來 a word of Latin ～
    ornament 裝飾品，點(diǎn)綴品 We bought ～s for the Christmas tree
    orthodox 正統(tǒng)的，正宗的 an ～ economic theory
    outline輪廓，外形 He saw the ～ of a house against the sky
    overflow 泛濫 Every spring the river ～s
    overhaul 大修，全面檢查，徹底革新～ a faulty machine
    overhear 偶然聽到，偷聽到I wouldn’t like to be ～d
    overlap 重疊，部分相同 The Renaissance overlapped the later Middle Ages
    overtake 趕上，超過 He ran out of the door to ～ her
    overthrow *，* a plot to ～ the government
    overwhelm 征服，壓倒，毀壞 He took 45% of the ballots and ～ed his two main rivals