『新东方在线托福听力』为托福考生准备了ETS托福TPO/【学术讲座】#17听力练习：What is the main topic of the talk?原文题目答案解析，TPO/【学术讲座】#17听力原文范文音频翻译。

托福TPO/【学术讲座】#17听力原文What is the main topic of the talk?【新东方在线】

According to the speaker, what is one of the main purposes of the "bladder" of oxygen in the space suit?

According to the speaker, what is one feature of the space suit that allows astronauts to work effectively in space?

What is the speaker’s attitude toward the space suit?

Listen to a part of talk on astronomy.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 part 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?

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