adj. 有效的，有法律效力的，正当的，健全的；
[例句] They put forward many valid reasons for not exporting...
[例句] It is valid to consider memory the oldest mental skill, from which all others derive...
adj. 短暂的，瞬间的，随时会发生的，时时刻刻的；
[例句] ...a momentary lapse of concentration...
[例句] His hesitation was only momentary.
adj. 臭名昭著的，臭名远扬的，声名狼藉的，恶名昭著；
[例句] ...an area notorious for drugs, crime and violence...
[例句] She told us the story of one of Britain's most notorious country house murders.
n. 橄榄，橄榄树，橄榄色，油橄榄；adj. 橄榄色的，黄褐色的，淡褐色的，橄榄绿的；
[例句] Olives look romantic on a hillside in Provence.
[例句] ...an olive grove.
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；
adj. （指线条、小径等）锯齿形的，之字形的， Z字形的；n. 锯齿形的线条、小径等；vi. 弯弯曲曲地走路，曲折地前进；
[例句] They staggered in a zigzag across the tarmac.
[例句] ...a zigzag pattern.
vt. 使（在法律或道义上）负有责任或义务，对…施以恩惠；adj. 有义务的，必要的；
[例句] The ruling obligates airlines to release information about their flight delays...
[例句] Under a separation agreement, he was obligated to pay his ex-wife £50,000 a year for life.
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.
vt. 把…排挤掉，取代，代替；
[例句] He may be supplanted by a younger man...
[例句] By the 1930s the wristwatch had almost completely supplanted the pocket watch.
adj. 有效的，显著的，生动的，说明问题的；v. 讲述( tell的现在分词)，告诉；
[例句] Herbert sat quietly through the telling of this saga...
[例句] These stories grow in the telling.
vi. 起伏，波动，呈波浪形，震动；vt. 波动，使波动，使起伏，使成波浪形；adj. 波状的，波动起伏的，波浪形的；
[例句] As we travel south, the countryside begins to undulate as the rolling hills sweep down to the riverbanks...
[例句] His body slowly undulated in time to the music.
vt. 对…要价过高，向…乱讨价，使…过度充电，压倒；n. 过高要价，超额装载，充电过度，装药过多；vi. 过度充电，讨价过高；
[例句] If you feel a taxi driver has overcharged you, say so...
[例句] She claims she was overcharged by £1,000.
adj. 手术的，（计划、法律等）实施中的，起作用的，最适合的，关键词句；n. 工作人员，（尤指）体力劳动者，密探，（尤指政府的）特工人员；
[例句] The commercial telephone service was no longer operative...
[例句] The Youth Training Scheme was operative by the end of 1983.
v. 水煮，偷猎，窃取，把…踏成泥浆；
[例句] Many wildlife parks are regularly invaded by people poaching game.
[例句] The company authorised its staff to poach customers from the opposition.
adj. 循规蹈矩的，整洁的，（人）一本正经；adv. 循规蹈矩地，整洁地；v. （使）一本正经，使整洁；
[例句] We tend to imagine that the Victorians were very prim and proper.
[例句] ...a rather prim British spinster.
n. （箭、子弹、抢、炮、等）群射，齐射，（质问，咒骂等的）迸发；vi. 群射，齐射，迸发，截击；vt. 进行群射，齐鸣；vt.& vi. （网球运动中）截击；
[例句] He volleyed the ball spectacularly into the far corner of the net...
[例句] McNeil volleyed more effectively in the second set.
n. 模仿，模拟，[生]拟态，拟色，假装，装病；
[例句] Training includes realistic simulation of casualty procedures.
[例句] ...a simulation of the greenhouse effect.
n. action，行动( action的名词复数 )，作用，动作，积极的活动；
[例句] The government is taking emergency action to deal with a housing crisis...
[例句] What was needed, he said, was decisive action to halt what he called these savage crimes.
n. 试验( test的名词复数 )，考验，测验，化
[例句] Either measure the temperature with a bath thermometer or test the water with your wrist...
[例句] Here the army has its ranges where Rapier missiles and other weaponry are tested...