vi. 协防，补防，支持，堵塞，复制，往后退；

[例句] Radio signals received from the galaxy's centre back up the black hole theory...

[例句] Her views are backed up by a 1989 Home Office report on crime.

v. 付给( pay的第三人称单数 )，付款，有利可图，（对…）有利；

[例句] Accommodation is free — all you pay for is breakfast and dinner...

[例句] We paid £35 for each ticket...

v. 凑合( piece的过去式和过去分词 )，凑成，修补，组合资料（以便了解情况）；

[例句] ...a piece of cake.

[例句] ...a piece of wood.

adj. 极地的，两极的，正好相反的，[化，物]磁极的，有磁性的；n. [几]极线，极面；

[例句] ...the rigours of life in the polar regions...

[例句] Warmth melted some of the polar ice.

n. 神父，牧师，司铎，司祭，领导者，神甫；vt. 使成为神职人员；

[例句] He had trained to be a Catholic priest.

adv. 首先，首要地，主要地，根本上，本来；

[例句] ...a book aimed primarily at high-energy physicists...

[例句] Public order is primarily an urban problem...

vt. 啄，啄食，啄出，啄穿，〈非〉轻吻，以迅速敷衍的方式亲吻；vi. 啄，小口地吃，不断地批评，吹毛求疵；n. 啄，啄痕，（啄出的）小洞，轻吻；

[例句] It was winter and the sparrows were pecking at whatever they could find...

[例句] Chickens pecked in the dust...

n. 前任，前辈，原有事物，前身，祖先；

[例句] He maintained that he learned everything he knew from his predecessor Kenneth Sisam.

[例句] The car is some 40mm shorter than its predecessor.

adj. 精通的，熟练的；n. 能手，老手，专家；

[例句] A great number of Egyptians are proficient in foreign languages.

n. 禁令，禁律，〈美〉禁酒，[美史]禁酒时期，[法]诉讼中止令；

[例句] ...a prohibition on discrimination.

[例句] ...prohibitions against feeding birds at the airport.

vi. 出汗，流汗；adj. 汗液可通过的，可随汗液排出的，排汗的，引起排汗的；

[例句] He began to perspire heavily.

[例句] ...mopping their perspiring brows.

adj. 有效的，强有力的，有权势的，烈性的，有说服力的；

[例句] Their most potent weapon was the Exocet missile...

[例句] The drug is extremely potent, but causes unpleasant side effects.

adj. 危险的，不确定的，不安全的，可疑的；

[例句] Our financial situation had become precarious.

[例句] ...the Government's precarious position.

n. 规诫，戒律，箴言；

[例句] ...an electoral process based on the precept that all men are born equal.

[例句] ...the precepts of Buddhism.

n. (plural form of plant,plant的复数形式)植物，农作物，植物( plant的名词复数 )，工厂，发电厂，幼苗；v. 种植( plant的第三人称单数 )，建立，移植（动物、植物），在（某处）栽种；

[例句] Water each plant as often as required.

[例句] ...exotic plants.

n. 箍，铁环，呼呼声；vt. 加箍于，包围；vi. 唬唬地叫，发呼呼声；

[例句] He had the duty receptionist almost jumping through hoops for him. But to no avail.

adj. 有前途的，有希望的，光明，有为；

[例句] A school has honoured one of its brightest and most promising former pupils.

n. 周长，周围，边

[例句] ...the perimeter of the airport...

[例句] Officers dressed in riot gear are surrounding the perimeter fence.

vt. 使瘫痪，使麻痹，使不能正常活动；

n. 前缀，人名前的称谓，前置代号（置于前面的单词或字母、数字）；

[例句] To telephone from the US use the prefix 011 33 before the numbers given here...

[例句] I soon learnt to read the licence plates' prefixes.