adj. 天阴的，多云的；vt. 使沮丧，包缝，遮蔽；n. [气象学]阴，阴天，遮盖物(尤指云、雾等，郁闷，忧愁，沮丧，[采矿]风桥；

[例句] For three days it was overcast...

[例句] The weather forecast is for showers and overcast skies...

adj. 超自然的，神秘的，隐藏的；n. 神秘学；vt. 隐蔽，[天]（使）掩（星）；vi. 定时隐蔽；

[例句] ...sinister experiments with the occult.

[例句] ...books dealing with the occult.

n. 嘘声，喝倒采；vt.& vi. 发出嘘声；int. （表示不满、轻蔑等）嘘，呸；

[例句] People were booing and throwing things at them...

[例句] Demonstrators booed and jeered him...

vt. 超过（范围），（尤指坏事或不欲之事）泛滥，蹂躏，蔓延；n. 泛滥成灾，超过限度；vi. 泛滥，超过限度；

[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. 进攻，（球队的）前锋，进攻方法，攻势；

vt.&vi. 工作过度或时间过长，把…做过头，对…使用过度：过于经常使用，装饰：把…的表面加以装饰；n. 过度工作；

[例句] He's overworking and has got a lot on his mind...

[例句] He overworks and underpays the poor clerk whom he employs.

n. 禁运（令），停止通商（令），禁止，限制；vt. 封（港），禁止（船只）出入港口，禁运，停止，扣留征用；

[例句] The United Nations imposed an arms embargo against the country...

[例句] He has called on the government to lift its embargo on trade with Vietnam.

n. 前景，展望，观点，见解，景色，眺望处；v. 瞪着看，瞧，比…漂亮，用目光压倒；

[例句] The illness had a profound effect on his outlook...

[例句] I adopted a positive outlook on life...

n. 过量用药；vi. 用药过量；vt. 给服过量的药；

[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. 孤儿；vt. 使成为孤儿；adj. 孤儿的，无双亲的；

[例句] I'm an orphan and pretty much grew up on my own.

[例句] ...a young orphan girl brought up by peasants...

n. 全套装备，一套服装，集体，组织；vt. 装备，配置设备，供给服装；vi. 得到装备；

[例句] She was wearing an outfit she'd bought the previous day...

[例句] I spent lots of money on smart new outfits for work.

adj. 斜，倾斜的，[数]非直角的，非垂直的，斜角，斜面，拐弯抹角的，间接的，暗中的；v. 倾斜；n. 倾斜物；

[例句] It was an oblique reference to his mother...

[例句] Mr Golding delivered an oblique warning, talking of the danger of sudden action.

n. 公文包，代表作品集，证券投资组合，部长[大臣]的职位；

[例句] After dinner that evening, Edith showed them a portfolio of her own political cartoons.

[例句] Short-term securities can also be held as part of an investment portfolio.

n. 誓言，誓约，妄用神名，渎神的言词，[法]宣誓，诅咒，咒骂语；

[例句] He took an oath of loyalty to the government...

[例句] He swore an oath promising to uphold and protect the country's laws and constitution.

vt. 使负担太重，使超载，超过负荷；n. 过多，过量，超负荷；

[例句] Don't overload the boat or it will sink...

[例句] Large meals overload the digestive system.

vt. 胜过，优于；

[例句] It was important for me to outdo them, to feel better than they were...

[例句] Both sides have tried to outdo each other to show how tough they can be.

adj. 迟钝的，（疼痛）不剧烈的，（印象）不鲜明的，钝角的；

[例句] I've really been very obtuse and stupid...

[例句] I'm a limited and obtuse clergyman while you're the expert.

n. 光环，荣光，（日月等的）晕；vt. 使有晕轮，围以光环；vi. 成晕轮；

[例句] The sun had a faint halo round it...

[例句] She angrily slung a scarf around her head, flattening her halo of hair.

adj. 可选择的，随意的，任意的，非强制的，选修科目；

[例句] A holiday isn't an optional extra. In this stressful, frantic world it's a must...

[例句] Sex education is a sensitive area for some parents, and thus it should remain optional.

开门，可得到，开业，张开，（使）出现；

[例句] As the market opens up, I think people are going to be able to spend more money on consumer goods...

[例句] He said he wanted to see how Albania was opening up to the world...