1. n.[C] When a woman who is about to give birth has contractions , she experiences a very strong, painful tightening of the muscles of her womb.（分娩时的）子宫收缩，宫缩
2. n.[C] A contraction is a shortened form of a word or words.（词的）缩约形式
decelerate同源
trail
1. n.[C] A trail is a rough path across open country or through forests.乡间小路;林间小道
2. n.[C] A trail is a route along a series of paths or roads, often one that has been planned and marked out for a particular purpose.（特定）路线，路径
3. n.[C] A trail is a series of marks or other signs of movement or other activities left by someone or something.（一串）痕迹，足迹，踪迹
4. v. If you trail someone or something, you follow them secretly, often by finding the marks or signs that they have left.跟踪;追踪;追猎
5. n.[C] You can refer to all the places that a politician visits in the period before an election as their campaign trail.(竞选)巡游路线
6. v. If you trail something or it trails , it hangs down loosely behind you as you move along.(使)拖在后面;(使)下垂;(使)曳地
7. v. If someone trails somewhere, they move there slowly, without any energy or enthusiasm, often following someone else.(常指跟着别人)拖沓行走，没精打采地走
8. v. If a person or team in a sports match or other contest is trailing , they have a lower score than their opponents.(比分)落后
9. phrase. If you are on the trail of a person or thing, you are trying hard to find them or find out about them.追踪;寻找
attract
1. v. If something attracts people or animals, it has features that cause them to come to it.吸引
2. v. If someone or something attracts you, they have particular qualities which cause you to like or admire them. If a particular quality attracts you to a person or thing, it is the reason why you like them.（人或事物）引起…的注意（或赞赏）；使对（某人或某事物）感兴趣
3. v. If you are attracted to someone, you are interested in them sexually.引起…的好感;吸引（异性）;诱惑
4. v. If something attracts support, publicity, or money, it receives support, publicity, or money.吸引，引来（支持、关注或金钱）
5. v. If one object attracts another object, it causes the second object to move towards it.（一物）吸引（另一物）；对（其他物体）产生引力
attractive
1. adj. A person who is attractive is pleasant to look at.（人）漂亮的，动人的，有魅力的
2. adj. Something that is attractive has a pleasant appearance or sound.（外形）漂亮的；（声音）优美的
3. adj. You can describe something as attractive when it seems worth having or doing.吸引人的;值得拥有（或做）的
trait
1. n.[C] A trait is a particular characteristic, quality, or tendency that someone or something has.特征;特点;特性
detractor
1. n.[C] The detractors of a person or thing are people who criticize that person or thing.诋毁者;贬低者;诽谤者
abstract
1. adj. An abstract idea or way of thinking is based on general ideas rather than on real things and events.抽象的；纯概念的
2. phrase. When you talk or think about something in the abstract , you talk or think about it in a general way, rather than considering particular things or events.大体上；理论上；抽象地
3. adj. In grammar, an abstract noun refers to a quality or idea rather than to a physical object.（名词）抽象的，表示抽象概念的
4. adj. Abstract art makes use of shapes and patterns rather than showing people or things.（艺术）抽象（派）的
5. n.[C] An abstract is an abstract work of art.抽象艺术作品
6. n.[C] An abstract of an article, document, or speech is a short piece of writing that gives the main points of it.摘要;梗概
attraction
1. n.[U] Attraction is a feeling of liking someone, and often of being sexually interested in them.爱慕;喜欢
2. n.[C] An attraction is a feature which makes something interesting or desirable.吸引力；诱惑力
3. n.[C] An attraction is something that people can go to for interest or enjoyment, for example a famous building.有吸引力的地方
