翻译土木工程专业英语，多谢了

7．The sudden expansion in transportation systems that began in the eighteenth century, and still continues in our own day, has enormously increased the need for bridges as a part of highways and railroads. Better understanding of the forces that are exerted on structures and the improved materials that became available in the nineteenth century have made it possible to built increasingly longer and stronger bridges. With the ability to span greater distances, the damlike effect of masonry arch bridges with several heavy piers that block the flow of a stream can be largely eliminated.

8．The development of reinforced and prestressed concrete has given engineers other important materials for bridge building. Concrete has been used particularly for relatively short span bridges that are a part of freeway systems. These bridges often use precast concrete beams. Many arch bridges have also been constructed of concrete. Currently, the longest concrete arch bridge is the Gladesvill

哥哥姐姐们帮小弟翻译一下土木工程专业英语 急 ！多谢啦 请教土木工程专业英语的翻译 求土木工程专业英语高手翻译(急) 请教土木工程专业英语的翻译-----急用 翻译 英语翻成中文 土木工程专业 请教土木工程专业英语的翻译-----急用,谢谢 谁知道哪有土木工程专业英语的翻译，十万火急！！ 翻译一段英语，多谢了 四川大学土木工程如何,多谢了? 不知那位专业人士可以帮我翻译以下求职简历（英语）？ 多谢了！