托福英语 学英语,练听力,上听力课堂! 注册 登录
> 托福 > 托福听力教程 > 托福听力短文 >  列表

托福听力短文 I-02-2

所属教程:托福听力短文

浏览:

gewei

随身学
扫描二维码方便学习和分享
http://online2.tingclass.net/lesson/shi0529/0008/8562/022.mp3
http://image.tingclass.net/statics/js/2012

(woman) Thank you. It's great to see so many of you interested in this series on "Survival in Outer Space." Please excuse the cameras - we're being videotaped for the local TV stations.

Tonight I'm going to talk about the most basic aspect of survival - the space suit. When most of you imagine an astronaut, that's probably the fist thing that comes to mind, right? Well, without spaces suits, it would not be possible for us to survive in space. For example, outer space is a vacuum - there's no gravity or air pressure; without protection, a body would explode. What's more, we'd cook in the sun or freeze in the shade - with temperatures ranging from a toasty 300 degrees above to a cool 300 degrees below zero Fahrenheit.

The space suit that NASA has developed is truly a marvel. This photo enlargement here is a life-size image of an actual space suit worn by astronauts on the last space shuttle mission. This past is the torso - it's made of seven extremely durable layers. This thick insulation protects against temperature extremes and radiation. Next is what they call a "bladder" of oxygen - that's an inflatable sac, filled with oxygen, to simulate atmospheric pressure. This bladder presses against the body with the same force as the Earth's atmosphere at sea level. The innermost layers provide liquid cooling and ventilation. Despite all the layers, the suit is flexible, allowing free movement so we can work.

Another really sophisticated part of the space suit is the helmet. I brought one along to show you. Can I have a volunteer come and demonstrate?

内容来自 听力课堂网:http://www.tingclass.net/show-8562-245181-1.html
用手机学英语,请加听力课堂微信公众号:tingclass123
用户搜索

疯狂英语 英语语法 新概念英语 走遍美国 四级听力 英语音标 英语入门 发音 美语 四级 新东方 七年级 赖世雄 zero是什么意思

  • 微信公众号:每日托福
  • [微信扫码,即可关注]
  • 关注有惊喜,经典托福资料免费送! 每天的精彩内容,不容错过。
  • 频道推荐
  • |
  • 全站推荐
  • 广播听力
  • |
  • 推荐下载
  • 网站推荐
0.093750