barrier

　　n.

　　屏障;障碍物 an object like a fence that prevents people from moving forward from one place to another

　　障碍;阻力;关卡 a problem, rule or situation that prevents sb from doing sth, or that makes sth impossible

　　分界线;隔阂;障碍 sth that exists between one thing or person and another and keeps them separate

　　难以逾越的数量或水平 a particular amount , level or number which it is difficult to get past

　　同义词

　　n. roadblock

　　参考例句

　　1. Green barrier is nowadays trade obstacle that enterprises have to face in international trade.

　　绿色壁垒是当今国际贸易中企业不得不面对的贸易障碍

　　2. Using the curving characteristic at the normal temperature, designs the more perfect sound barrier.

　　利用常温下可自然弯曲的特性，设计出更加完美的声屏障

　　3. Although the UML defines a precise language, it is not a barrier to future improvements in modeling concepts.

　　尽管UML定义一种精确的语言，它不是到在建模概念的未来改进的一个障碍

　　参考例句

　　1.N-COUNT A barrier is something such as a rule, law, or policy that makes it difficult or impossible for something to happen or be achieved. 障碍

　　例：Duties and taxes are the most obvious barrier to free trade.

　　关税及其他各种税是自由贸易最明显的障碍

　　2.N-COUNT A barrier is a problem that prevents two people or groups from agreeing, communicating, or working with each other. 障碍; 隔阂

　　例：There is no reason why love shouldnt cross the age barrier.

　　爱情没有理由不应跨越年龄障碍

　　例：She had been waiting for Simon to break down the barrier between them.

　　她一直在等着西蒙来破除他们之间的隔阂

　　3.N-COUNT A barrier is something such as a fence or wall that is put in place to prevent people from moving easily from one area to another. 栅栏; 围墙

　　例：The demonstrators broke through heavy police barriers.

　　示威者们冲破了警方的重重关卡

　　4.N-COUNT A barrier is an object or layer that physically prevents something from moving from one place to another. 屏障

　　例：A severe storm destroyed a natural barrier between the house and the lake.

　　一场猛烈的暴风雨摧毁了房屋和湖泊之间的天然屏障

　　5.N-SING You can refer to a particular number or amount as a barrier when you think it is significant, because it is difficult or unusual to go above it. 大关

　　例：They are fearful that unemployment will soon break the barrier of three million.

　　他们担心失业人数不久将突破300万大关

　　常见用法

　　用作名词

　　The ice skater rammed into the barrier.

　　溜冰者撞到护栏上了

　　Heavy duties on imports and exports are a barrier to international trade.

　　进出口的高关税是国际贸易的障碍

　　The Sahara Desert is a natural barrier between north and central Africa.

　　撒哈拉沙漠是北非与中非之间的天然屏障