第二篇The World's Longest Bridge
Rumor has it that a legendary〔传说〕 six-headed monste〔怪物、巨大的〕r lurks〔潜伏、埋伏〕 in the deep waters of the Tyrrhenian Sea between Italy and the island of Sicily. If true, one day you might spy the beast 〔野兽〕while zipping 〔呼啸而过〕 across the Messina Strait Bridge. When completed in 20l0,the world's longest bridge will weigh nearly 300 ,000 tons－equivalent投资项目管理〔相等的〕to the iceberg that sank the Titanic－and stretch〔伸展、延伸〕点突变5 kilometers long. "That's nearly 50 percent longer than any other bridge ever built , "says structural〔结构的〕engineer Shane Rixon.
What do the world's longest bridges have in common?They're suspension〔悬浮〕 bridges , massive structures built to span〔跨越〕 vast〔广阔的〕water channels or gorges. A suspension bridge needs just two towers to shoulder the structure's mammoth〔巨大的〕weight , thanks to hefty supporting 戊戌变法时间cables〔绳索〕slung〔吊挂〕between the towers and 关于规则的议论文anchored〔锚〕 firmly〔坚固地〕in deepof cement〔水泥〕 at each end of the bridge . The Messina Strait Bridge will have two 54, 100-ton towers，which will support mo
流动人口服务管理st of the bridge's load. The beefy〔结实的〕cables of the bridge, each l.2 meter in diameter〔直径〕 , will hold up the longest and widest bridge deck ever built.
When construction begins on the Messina Strait Bridge in 2005 , the first job will to erect〔建立〕 two 370meter-tall steel towers. The. cond job will be to pull two ts of steel cables across the strait〔海峡〕, each t being a bundle〔捆〕of 44 ,352 individual steel wires.Getting the cables up will be something.It's not just their length - totally 5.3 kilometers - but their weight. They will tip up the scales at l66 ,500 tons - more than half the bridge' s total mass〔质量〕.
After lowering vertical〔垂直的〕"suspender〔吊杆〕" cables from the main cables, builders will erect a 60-meter-wide 54 , 630-ton steel roadway〔路面、道路、车道〕, or deck〔桥面〕 - wide enough to accommodate〔容纳〕 l2 lanes〔车道〕 of traffic.The deck' s weight will pull〔拉〕 down on the cables with a force of 70 ,500 tons. In return , the cables yank up against their firmly rooted anchors with a force of l39,000 tons - equivalent to the weight of about l00,000 cars. Tho anchors are esntial〔必须品〕. They're what will keep the bridge from going anywhere.
练习：
A Some environmentalists水平位移〔环保人士〕 are against the project on biological grounds.
B What do the world's longest bridges have in common?
C If true, one day you might spy the beast 〔野兽〕while zipping 〔呼啸而过〕 across the Messina Strait Bridge.
D They're what will keep the bridge from going anywhere.
E The. cond job will be to pull two ts of steel cables across the strait〔海峡〕, each t being a bundle〔捆〕of 44 ,352 individual steel wires.
F They will tip up the scales at l66 ,500 tons - more than half the bridge' s total mass〔质量〕.
第二篇世界上最长的桥
据传说，在意大利和西西里岛间的第勒尼安海的深处，潜伏着一头神奇的六头怪兽。如果这是真的，你有可能在飞驶过墨西拿海峡桥时窥视到这怪物。到2010年该桥竣工的时候，它将是一座世界上最长且重达30万吨的大桥，这个重量近似于撞沉泰坦尼克号巨轮的冰山的重量。这座桥桥长约5千米，桥的结构工程师雪恩·里克森说：“它比有史以来最长的桥还长出约50%”
那么，世界上最长的这些桥之间有什么共同点呢?它们都是吊桥，有着巨大的桥的构架，横跨航道或峡谷间的巨大水域。一座吊桥只需要两个塔身来支撑桥的巨大重量，这多亏了吊挂在塔之间并紧紧固定在桥头底部的水泥柱上的高强度的支撑绳索。墨西拿海峡桥的两座塔将分别重54100吨，它们将支撑住桥的大部分重量。桥的绳索很结实，每条直径1.2米，它们将支起建桥史上最长最宽的桥板。
墨西拿海峡桥的建造将于2005年开始，那时要做的第一项工作将是竖立起两座370米高的铁塔。第二项工作将是在海峡两端支起两套钢索，每一套绳索由44352根单独的钢缆组成。把这些钢缆举起来是很不容易的。这不仅仅体现在钢缆很长〔共有5.3千米〕，而且也由于它们的重量，它们将重达166500请假单怎么写吨，这个重量已超过了桥总重量的一半。
在从主绳索上降下垂直的悬索后，建造者将造起一条60米宽54630吨重的公路，或者说是桥板，这个宽度的路将可容纳12条交通车道。桥板的重量将使两端的钢索负重70500盗心贼歌词吨。反过来，相应的钢索将以139000吨的力度拽着牢牢扎根了的固定物，这个力度近似于10万辆轿车的总重量。这些锚是很必要的，正是这些锚防止了桥的随便移动。
