| objection | n.反对，异议；反对的理由 | Her objection was that he was too young. | 她提出的反对理由是他还太小。 |
| obligation | n.义务，责任 | Employers have an obligation to treat all employees equally. | 雇主有责任对所有员工一视同仁。 |
| oblige | vt.迫使；施恩于，帮…的忙；使感激 | Circumstances had obliged him to sell the business. | 情况迫使他把公司卖了。 |
| obscure | a.不著名的；费解的 vt.使变模糊，掩盖 | an obscure poet | 名不见经传的诗人 |
| observation | n.观察；评论[ pl.]观察资料；观察力 | He spent two nights under close observation in hospital. | 他在医院接受了两个晚上的密切观察。 |
| observe | vt.注意到；观察；评论；遵守，奉行 | Scientists have observed a drop in ozone levels over the Antarctic. | 科学家已经观察到南极洲上方的臭氧浓度下降了。 |
| obsession | n.困扰，无法摆脱的思想(或情感) | Gambling became an obsession , and he eventually lost everything. | 他迷上了赌 博，最后输得精光。 |
| obsolete | a.过时的 | obsolete weapons | 已被淘汰的武器 |
| obtain | vt.获得，得到 vi.通用，流行，存在 | You will need to obtain permission from the principal. | 你需要得到校长的同意。 |
| pace | n.(一)步；速度，节奏 vi.踱步 | The pace of change in our lives is becoming faster and faster. | 我们生活的变化速度越来越快。 |
| pack | v.捆扎，打包；塞满 n.包，(一)群，(一)副 | I forgot to pack my razor. | 我忘记把剃须刀放入行李包了。 |
| pad | n.垫；便笺本 vt.填塞vi (放轻脚步)走 | Use an abrasive pad for stubborn stains. | 用百洁布擦洗顽固污渍。 |
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