2014年12月英语六级听力备考练习2
英语六级听力部分算是同学们考试时的难点吧。听力这部分不能急于求成，需要时间来练习。对于这部分同学们平时在积累词汇的基础上多加练习就可以，听的多了就能掌握技巧，距离12月份的四六级考试还有一段时间，同学每天练习一点听力，考试时听力就能取得高分了。听力音频点击下载
听力材料：
This car can reach 320 kilometers per hour and is set to be entered in the Le Mans 24-hour race. It is the result of several prototypes built by Strakka Racing, a company based in Silverstone, England-the home of Britain's motor sports.
"Motorsports is such a competitive industry that if you're slow in bringing something to the track, you fall behind, and once you fall behind it's almost impossible to catch up,” said Dan Walmsley, engineer and team principal for Strakka Racing.
Like many other teams, Strakka has been using 3-D printing of components to try out designs and materials as quickly as possible. But the company is now producing the actual car parts using the 3-D print technology, which is essentially adding layers of material under computer control to get a desired shape.
"So we've got aerodynamic components on the car such as the front dive planes, the air intake, interior components. We found that the material properties have recently moved forwards to a point where they're stiff enough and strong enough and light enough to function as a fully finished production component on a race car."
A Dutch producer is developing smaller drones for use in everyday life, like surveying areas for fires or other problems.
"At the moment we're working on drone-to-drone communication, that is where a drone can talk with another drone and knows where he is in the area, at this stage we're developing this. For the future, drones will only get smarter and smaller and will do stuff we cannot imagine now," said Joost Hezemans, head of design for drone manufacturer Aerialtronics.
Movie costume makers also find the technology useful.
"Not so long ago if we'd have invested a lot of time in making a prototype, if we found that it didn't fit or we had to change it dramatically, you know, you're really going back massive amount of weeks of work. Now, you can make the modifications pretty quick," said Grant Pairman, costume manufacturer for FBFX Ltd.
Naomi Kaempfer, creative director of Stratsys, a U.S. manufacturer of 3-D printers, says manufacturing in 3-D printing is still evolving.
“We are still waiting for 3-D printed materials that have the right durability and the strength that textile fiber allows. We have to understand that 3-D printing is an additive layered technology, and in order to create fiber strength you actually need to have a continuous fiber going through the material,” said Kaempfer.
Today, 3D printing has come a long way from the time when it served to produce models for plastic surgeons, architects and manufacturers to only visualize the final product.
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