vt. 表示…的意思，意味，预示；vi. 具有重要性，要紧，辱骂；
[例句] The contrasting approaches to Europe signified a sharp difference between the major parties...
[例句] The symbol displayed outside a restaurant signifies there's excellent cuisine inside.
adj. 光滑的，熟练的，灵巧的，机灵的，聪明的，华而不实的；n. 光滑之处，[机]平滑器，[机]修光工具，一层浮油；vt. 使光滑，使光亮，使美观，使齐整，占…的便宜；adv. 灵活地，聪明地，熟练地，巧妙地；
[例句] There's a big difference between an amateur video and a slick Hollywood production...
[例句] His style is slick and visually exciting.
adj. 侵略的，侵犯的，攻势的，（美）有进取心的，积极行动的，有进取心的，有闯劲的，好争斗的，借故生端的，爱打架的，要打架的；
[例句] Some children are much more aggressive than others...
[例句] These fish are very aggressive...
n. 微风，轻而易举的事；vi. 吹微风，逃走；
[例句] ...a cool summer breeze.
[例句] Lopez breezed into the quarter-finals of the tournament...
n. 分类，分级，类别，（动植物等的）分类学；
[例句] Its tariffs cater for four basic classifications of customer.
n. 补充，补足语，补充物，补集（数）；vt. 补足，补充，补助；
[例句] Nutmeg, parsley and cider all complement the flavour of these beans well.
[例句] There will be a written examination to complement the practical test...
n. 危险，危险物，威胁；
[例句] My friends endured tremendous danger in order to help me...
[例句] His life could be in danger.
n. 困难，麻烦，难事，难度，异议，争论，纠葛，财政困难，（经济）拮据；
[例句] ...the difficulty of getting accurate information...
[例句] The country is facing great economic difficulties.
n. 扩散，扩散，传播，（文化等的）传流；
[例句] Over time, the technology is diffused and adopted by other countries.
[例句] ...an attempt to diffuse new ideas...
adj. 遥远的，冷漠的，冷淡的，远离的，远隔的，不太清晰的；
[例句] The mountains rolled away to a distant horizon.
[例句] ...the war in that distant land.
adj. 明显的，清楚的，卓越的，不寻常的，有区别的，确切的；
[例句] Engineering and technology are disciplines distinct from one another and from science...
[例句] This book is divided into two distinct parts.
n. 驾驶员，司机，驱动器，驱动程序，驱逐者，驱赶者，（高尔夫球）球棒；
[例句] The driver got out of his van.
[例句] ...a taxi driver.
vi. 爆[突]发，发怒，激增，迅速扩大；vt. （使）爆炸，突然（发出巨响，活跃起来，迸发感情），推翻，驳倒；
[例句] They were clearing up when the second bomb exploded...
[例句] A school bus was hit by gunfire which exploded the fuel tank.
n. 疲劳，疲乏，劳务杂役，（士兵穿的）工作服；vt. 使疲劳，使疲乏；vi. 疲劳；
[例句] She continued to have severe stomach cramps, aches, fatigue, and depression...
[例句] Clarke says his team could have lasted another 15 days before fatigue would have begun to take a toll.
vt.& vi. 变平，使（某物）变平，打倒，击倒，使失去光泽；
[例句] He carefully flattened the wrappers and put them between the leaves of his book...
[例句] The dog's ears flattened slightly as Cook spoke his name.
adj. 灵活的，易弯曲的，柔韧的，易被说服的；
[例句] ...brushes with long, flexible bristles.
[例句] Look for software that's flexible enough for a range of abilities.
vt.& vi. （使）闪烁，（使）闪亮；n. 闪光，闪亮，闪现，流露；
[例句] His black hair gleamed in the sun.
[例句] ...a gleaming red sports car.
vi. 犹豫，踌躇，不愿，支吾，停顿；vt. 对…犹豫，不情愿；
[例句] The telephone rang. Catherine hesitated, debating whether to answer it...
[例句] She hesitated a long time and then she said 'Yes'.
vt. 哀号，吼叫；vi. 嚎叫，咆哮，哀嚎，开心地狂笑，狂欢；n. 嗥叫，嚎哭，及其可笑的事物；
[例句] Somewhere in the streets beyond a dog suddenly howled, baying at the moon.
[例句] He howled like a wounded animal as blood spurted from the gash...
n. 液体，流音；adj. 液体的，清澈的，（声音）流畅的，易转换成现款的；
[例句] Drink plenty of liquid...
[例句] Boil for 20 minutes until the liquid has reduced by half...