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obstacle/ˈɔbstəkl/n.［c］障碍物，障碍：an obstacle race障碍赛跑Lack of education is an obstacle to success.缺少教育是成功的障碍。［考句］Not having a good command of English can···

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obstruct/əbˈstrʌkt/vt.阻隔，阻塞：She was obstructing the entrance.她正在把入口堵住。He was charged for obstructing the highway.他因阻碍交通而受控告。Tall trees obstructed his v···

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obtain/əbˈtein/vt.得到，获得，买到：obtain a scholarship(a license )获得奖学金（一张执照）；obtain first-hand information得到第一手信息；obtain some refreshment买到一些点心［辨析···

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obvious/ˈɔbviəs/adj.明显的，显而易见：Your meaning was obvious.你的意思是显而易见的。I don’t write about physics, for obvious reasons.我不写有关物理的东西，原因是显而易见的。ob···

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occasion/əˈkeiʒən/n.［c］1.场合，时刻，日子：on a public occasion在公开场合；celebrate an occasion with a dinner设宴庆祝某个日子2.时机，机会：choose one’s occasion选择时机；of···

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occupancy/ˈɔkjupənsi/n.［u］占有，占用期；居住：The occupancy rate of beds has been averaging out about 80 percent.病床占用率平均保持在80％左右。He took uninterrupted occupancy ···

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occupation/ˌɔkjuˈpeiʃən/n.1.［u］占领，占有: military occupation军事占领；be under enemy occupation在敌人占领下No one is yet in occupation of the house.尚未有人住进这所房子。2···

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occupy/ˈɔkjupai/vt.占领；占用(职务，时间)；占据(头脑，思想)：Enemy troops occupied the country.敌军占领了这个国家。Is anyone occupying this seat?有人占了这个位置吗? He is too muc···

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occur/əˈkə:/vi.(occurred /-d/; occurring /-riŋ/) 1.发生：At the beginning of August an event occurred.八月初发生了一个事件。Several fires (storms) have occurred.发生了几次火灾(···

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ocean/ˈəuʃən/n.［c］海洋：the Pacific Ocean太平洋；an ocean voyage航海The world is made up of seven continents and four oceans.世界由七大洲四大洋组成。