pron. 谁，什么人，关系代词，有先行词，孰；

[例句] Who's there?...

[例句] Who is the least popular man around here?...

n. 乐观，乐观主义；

[例句] The Indian Prime Minister has expressed optimism about India's future relations with the USA.

[例句] ...a mood of cautious optimism.

adj. 必须的，应尽的，义务的，强制性的；

[例句] Most women will be offered an ultrasound scan during pregnancy, although it's not obligatory...

[例句] These rates do not include the charge for obligatory medical consultations.

adj. 眼睛的，视觉的，光学的，镜片；

[例句] The reason for this is that the optic nerve is a part of the brain.

n. 禁忌，忌讳，戒律，禁忌的事物（或行为）；adj. 禁忌的，忌讳的；vt. 把…列为禁忌，禁止；

[例句] The topic of addiction remains something of a taboo...

[例句] Religious dogmas often include strong sexual taboos and can create in children the impression that sex is sinful.

n. 疏忽，监督，照管，失察，负责；

[例句] William was angered and embarrassed by his oversight...

[例句] By an unfortunate oversight, full instructions do not come with the product.

n. 振动，动摇，波动，振荡；

[例句] I checked to see if the needle indicating volume was oscillating.

[例句] The share price has oscillated between a five-year high of 157.25p in 1997 and this year's low of 91.5p...

n. 气味，臭气，声望，名誉；

[例句] The whole herb has a characteristic taste and odour...

[例句] The taste is only slightly bitter, and there is little odour.

adj. 油的，油质的，含油的，油多的，油腻的，油滑的，会奉承的；

[例句] He was wiping his hands on an oily rag...

[例句] When she was younger, she had very oily skin...

n. 女高音，女高音歌手，唱最高音者，高音部；adj. 女高音的，最高音的；

[例句] She was the main soprano at the Bolshoi theatre.

[例句] ...a pretty girl with a sweet soprano voice.

n. （船或飞机装载的）货物，负荷，荷重；

[例句] The boat calls at the main port to load its regular cargo of bananas.

[例句] ...cargo planes.

n. 照片，相片；vt.& vi. （给…）拍照；

[例句] We must take a photo!...

[例句] I've got a photo of him on the wall.

n. 专业人员，职业选手，老手；adj. 职业的，专业的；prep. 赞成，支持；

[例句] In the professional theater, there is a tremendous need to prove that you're a pro...

[例句] I have enjoyed playing with some of the top pros from Europe and America.

n. 管弦乐队，管弦乐队的全部乐器；

[例句] ...the Royal Liverpool Philharmonic Orchestra.

adj. 粗暴的，无法容忍的，反常的，令人惊讶的；

[例句] I must apologise for my outrageous behaviour...

[例句] Charges for local telephone calls are particularly outrageous.

vt. 夸大（某事），把…讲得过分，夸张；

[例句] The authors no doubt overstated their case with a view to catching the public's attention...

[例句] The importance of health education cannot be overstated.

n. 机会( occasion的名词复数 )，时刻，原因，需要；

[例句] I often think fondly of an occasion some years ago at Covent Garden...

[例句] Mr Davis has been asked on a number of occasions.

n. 天文台，气象台，瞭望台；

n. 攻击，袭击，开始，动手，[医]发病；

[例句] Most of the passes have been closed with the onset of winter...

[例句] With the onset of war, oil prices climbed past $30 a barrel.

n. 渗透（作用），潜移默化，耳濡目染；

[例句] ...the processes of diffusion and osmosis.

[例句] She allowed her life to be absorbed by his, taking on as if by osmosis his likes and dislikes.