[交流] 每周一听——那些年我们一起练过的听力（第177期）已有27人参与

每周一听——那些年我们一起练过的听力（第177期）

如果对本活动有兴趣就收听我吧！！！

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评分规则：
每篇设空十处，每答对一空奖励一个BB，全对的虫子可得15个BB奖励。有好的建议大家可以跟帖留言，加油哦~~~~~~

Powerful impacts and falls are an     (1)    part of American football, the most popular sport in the United States.
In 2010, the National Football League     (2)    that despite protective helmets players often suffer dangerous     (3)    , leading to a life-long brain injury called "chronic traumatic encephalopathy."
Scientists at Cardiff and Cambridge universities say with the help of a supercomputer, they produced a multi-layered material that    (4)    the energy of impact much better than currently used polymer foams.
“It is a series of folds based on origami. So if you were to stack a series of playing cards at home, perhaps then you would come up with a    (5)    that might not look too dissimilar to this," said Peter Theobald of Cardiff University.
Testing geometrically complex shapes, researchers found that by changing the    (6)    of cell walls they could activate the ability of the material, they named C3, to    (7)    impacts from various angles.
Samples printed in a 3-D printer were tested for impacts and the results were again    (8)    with computer models. Scientists say by combining 3-D printing with the standard manufacturing process of injection molding, the new material can be produced in specific shapes.
“I think with this kind of material we can more than improve the    (9)    of the helmet ... we can design a specific helmet, for example, for each head in the world," said Rafael Santiago of University of Sao Paulo.
Researchers say if the same design could also be printed in 3-D metal printers, it could be help protect    (10)    vehicles from various explosive devices.
小伙伴们，上一期活动参加的人数明显增多，增加了10几个小伙伴，很高兴大家的支持，希望大家继续坚持每周一听，我们的活动会越来越火，大家的英语能力也会越来越强，这期活动是我组织该活动以来的第四期，这期为止，请连续参加4次本活动的小伙伴私信我，我将给予15个金币的奖励。请大家记住：“Knowledge advances by steps and not by leaps.” ，小伙伴们让我们行动起来吧！“Action speaks louder than words”
上期答案
1. pledges
2. effects
3. renewables
4. premature
5. conversion
6. outweigh
7. politicians
8. benefits
9. responding
10. immediately