托福听力短文 I-02-2

(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 Fahrenheit¹.

The space suit that NASA has developed is truly a marvel². 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 durable³ layers. This thick insulation⁴ 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 atmospheric⁵ 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?

1 Fahrenheit   

n./adj.华氏温度；华氏温度计(的)

参考例句：

• He was asked for the boiling point of water in Fahrenheit.他被问到水的沸点是华氏多少度。
• The thermometer reads 80 degrees Fahrenheit.寒暑表指出华氏80度。

2 marvel   

vi.(at)惊叹vt.感到惊异；n.令人惊异的事

参考例句：

• The robot is a marvel of modern engineering.机器人是现代工程技术的奇迹。
• The operation was a marvel of medical skill.这次手术是医术上的一个奇迹。

3 durable   

adj.持久的，耐久的

参考例句：

• This raincoat is made of very durable material.这件雨衣是用非常耐用的料子做的。
• They frequently require more major durable purchases.他们经常需要购买耐用消费品。

4 insulation   

n.隔离；绝缘；隔热

参考例句：

• Please examine the insulation of the electric wires in my house.请检查一下我屋子里电线的绝缘情况。
• It is always difficult to assure good insulation between the electric leads.要保证两个电触头之间有良好的绝缘总是很困难的。

5 atmospheric   

adj.大气的，空气的；大气层的；大气所引起的

参考例句：

• Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
• Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。