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业余爱好英文托福听力TPO12原文 Lecture 4-智课教育旗下智课教育
以下是小编为大家整理的托福听力TPO12原文中Lecture 4的文本内容，希望大家能够认真阅读，不懂的地方可以参考翻译，相信会有所收获。
下面就让小编来为大家介绍一下托福听力TPO12原文中Lecture 4的文本内容吧，大家要好好把握，这些都是非常有价值的材料，同时，大家也可以登录智课教育论坛进行TPO练习辅导，希望能够给准备托福听力的同学带来帮助。
TPO12 Lecture 4
Environmental science
Professor：All right folks, let’s continue our discussion of alternative energy sources and move on to what’s probably the most well-known alternative energy source---solar energy. The sun basically provides earth with virtually unlimited source of energy every day, but the problem has always been how do we tap this source of energy. Can anyone think of why it’s so difficult to make u of solar energy？
Student A：Becau it is hard to gather it？
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Professor：That’s exactly it. Solar energy is everywhere, but it’s also quite diffud. And the thing is the dream of solar energy is not a new one. Humanity has been trying to u the sun’s light as a reliable source of energy for centuries. And around the beginning of the 20th century there were actually some primitive solar water heaters on the consumer market. But they didn’t ll very well. Any of you wanna guess why？
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Student A：Well, there were other energy choices like oil and natural gas, right？巧克口语
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Professor：Yeah. And for better or for wor, we cho to go down that path as a society.When you consider economic factors, it’s easy to e why. But then in the 1970s, there was an interest in solar energy again. Why do you think that happened？
Student B：Becau oil and natural .became scarce？
Professor：Well, not exactly. The amount of oil and natural gas in the earth was still plentiful, but there were other reasons. It’s a political thing really and I’m gonna get into that now. So what happened in the 1970s was oil and natural gas became very expensive very quickly, and that spurred people to start looking into alternative forms of energy, solar energy probably being the most popular.But then in the 80s, this trend reverd itlf when the price of oil and natural gas went down.Alright let’s shift our focus now to some of the technologies that have been invented to overcome the problem of gathering diffud solar energy. The most basic solution is simply to carefully place windows in a building, so the sun shines into the building and then it’s absorbed and converted into heat. Can anyone think of where this is most commonly ud？mk
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Student A：Greenhous.
Professor：Yep, greenhous where plants are kept warm and provided with sunlight becau the walls of the building are made entirely of glass. But we do also have more complex systems that are
ud for space heating and they fall into two categories, passive and active heating systems.Passive systems take advantage of the location or design of a hou. For example, solar energy is gathered through large glass panels facing the sun. The heat is then stored in water-filled tanks or concrete. No mechanicaldevices are ud in passive heating systems. They operate with little or no mechanical
assistance.With active systems, on the other hand, you collect the solar energy at one location, and then you u pumps and fans苏木精>脾气不好
to move heat from the collectors through a plumbing system to a tank, where can be ud to heat a home or to just provide hot water.
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