n. 胚珠，卵子，原卵；

int. （痛苦或惊讶时的叫声）哎哟；

[例句] She was barefoot and stones dug into her feet. 'Ouch, ouch,' she cried.

n. 正牙学；

v. 阻塞( obstruct的现在分词 )，堵塞，阻碍，阻止；

[例句] Tractors and container lorries have completely obstructed the road.

[例句] A number of local people have been arrested for trying to obstruct lorries loaded with logs...

v. 观察，研究( observe的第三人称单数 )，遵守，（尤指为科学目的的）观察，看到；

[例句] Stern also studies and observes the behaviour of babies...

[例句] Are there any classes I could observe?...

adj. 拟声的，声喻的；

v. 迫使做( oblige的第三人称单数 )，使负义务，满足请求，施惠；

[例句] The storm got worse and worse. Finally, I was obliged to abandon the car and continue on foot...

[例句] This decree obliges unions to delay strikes.

v. 在…上铺或盖( overlay的过去式和过去分词 )，（尤指以感情或品质）撒满，遮掩，制作照相地图( photomap的过去式和过去分词 )，覆盖；

[例句] The floor was overlaid with rugs of oriental design.

[例句] ...woollen cloth, overlaid with gold and silver embroidery.

v. 使…模糊不清，掩盖( obscure的第三人称单数 )；

[例句] The origin of the custom is obscure...

[例句] The hymn was written by an obscure Greek composer for the 1896 Athens Olympics.

v. 使…用药过量( overdose的过去式和过去分词 )；

[例句] Each year, one in 100 girls aged 15-19 takes an overdose...

[例句] In 1970, guitarist Jimi Hendrix died of a drug overdose.

n. 工作人员( operative的名词复数 )，（尤指）体力劳动者，密探，（尤指政府的）特工人员；

[例句] The commercial telephone service was no longer operative...

[例句] The Youth Training Scheme was operative by the end of 1983.

v. 任命（某人）为牧师( ordain的过去式和过去分词 )，授予（某人）圣职，（上帝、法律等）命令，判定；

[例句] He was ordained a Catholic priest in 1982...

[例句] Women have been ordained for many years in the Church of Scotland...

n. 对立面，对立物，相反的人[事物]( opposite的名词复数 )，反义词，[数学]对边；

[例句] Jennie had sat opposite her at breakfast.

[例句] ...the opposite corner of the room.

v. 追上，赶上，超过( overtake的第三人称单数 )，（不愉快的事情）突然发生，突然降临，（在数量或重要性方面）大于；

[例句] When he eventually overtook the last truck he pulled over to the inside lane...

[例句] The red car was pulling out ready to overtake.

v. 使…模糊不清，掩盖( obscure的现在分词 )；

[例句] The origin of the custom is obscure...

[例句] The hymn was written by an obscure Greek composer for the 1896 Athens Olympics.

v. 阻塞( obstruct的第三人称单数 )，堵塞，阻碍，阻止；

[例句] Tractors and container lorries have completely obstructed the road.

[例句] A number of local people have been arrested for trying to obstruct lorries loaded with logs...

v. 使…用药过量( overdose的现在分词 )；

[例句] Each year, one in 100 girls aged 15-19 takes an overdose...

[例句] In 1970, guitarist Jimi Hendrix died of a drug overdose.

n. 大修，拆修，卸修，翻修；v. 彻底检查( overhaul的现在分词 )，大修，赶上，超越；

[例句] They had ensured the plumbing was overhauled a year ago...

[例句] Our car was towed away to have its suspension overhauled.

v. 超过（范围）( overrun的第三人称单数 )，（尤指坏事或不欲之事）泛滥，蔓延，多用（时间、钱财等）；

[例句] A group of rebels overran the port area and most of the northern suburbs...

[例句] The centre of New Delhi was overrun by an armed mob which attacked government buildings.

n. （强烈的）反对( opposition的名词复数 )，反对党，（事业、竞赛、游戏等的）对手，对比；

[例句] The government is facing a new wave of opposition in the form of a student strike...

[例句] Much of the opposition to this plan has come from the media.