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

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