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Horizon - Life On Mars 火星生命 - 4

These discoveries raised the stakes. Here was a planet similar to our own. Mars might not have cities or civilizations. But it could be home to other smaller life forms like microbes. Chris McKay is N

发表于:2018-12-07 / 阅读(156) / 评论(0)

火星生命

Horizon - Life On Mars 火星生命 - 2

I think it is exciting. Because it would imply that if life arose independently on Mars. The implication is that life is pervasive throughout the universe. This is why Mars has so obsessed scientists.

发表于:2018-12-07 / 阅读(125) / 评论(0)

火星生命

Horizon - Life On Mars 火星生命 - 1

In 2001 a new NASA probe was launched. Called Odyssey, it was sent to Mars to carry out the most detailed analysis ever of the planet’s surface. What it has discovered may be about to answer one of

发表于:2018-12-07 / 阅读(117) / 评论(0)

火星生命

Horizon - Life On Mars 火星生命 - 8

But even if there had been water, life doesn't start overnight. Even a simple microbe is the product of complex chemical systems that take millions of years to evolve. Had the water lasted long enough

发表于:2018-12-07 / 阅读(114) / 评论(0)

火星生命

Horizon - Life On Mars 火星生命 - 7

Rice had seen the same thing in Iceland, one of the few places on Earth with similarities to Mars. It too is extremely cold, and most of the water is frozen into glaciers. And also like Mars, buried u

发表于:2018-12-07 / 阅读(142) / 评论(0)

火星生命

Horizon - Life On Mars 火星生命 - 6

For Mars to have rivers, it must once have had streams, rain, clouds and an atmosphere, a planet just like the Earth today-if these were rivers. They had to be sure. The answers would come in 1998 wit

发表于:2018-12-07 / 阅读(152) / 评论(0)

火星生命

Horizon - Life On Mars 火星生命 - 5

William Boynton is professor of planetary sciences at the University of Arizona. And he's dedicated his life to looking for water on Mars. The link between life and water is very strong. Even here in

发表于:2018-12-07 / 阅读(142) / 评论(0)

火星生命

【租住公寓】垃圾处理器-Garbage Disposal

A: Hi, Tom. This is Hannah from apartment 4C. B: Oh, hi, Hannah. A: There is something wrong with my garbage disposal. B: Exactly what's going on? A: When I turn on the disposal switch, all I get is silence. B: When did this happen? A: Well, about a

发表于:2018-12-26 / 阅读(144) / 评论(0)

租住公寓-Renting an Apartment

学个词 Learn a Word-VOA英语教学 3058 disposal

今天我们要学的词是disposal. Disposal 名词，有处理，处置的意思。The disposal of an unexploded World War II bomb led to the evacuation of thousands of people in a large area in Berlin. 为拆除一枚二战期间没有引爆的炸弹

发表于:2018-12-30 / 阅读(129) / 评论(0)

英语单词荟萃

Horizon - Life On Mars 火星生命 - 15

Of course, any terraforming is still a long way off. The next few expeditions to Mars will definitely be made by machines. NASA, are sending 2 rovers, capable of travelling over 100 meters a day in se

发表于:2019-01-02 / 阅读(133) / 评论(0)

火星生命

Horizon - Life On Mars 火星生命 - 14

Well, hearing that Odyssey had found subsurface water on Mars was enormously exciting for somebody who is involved in planning to send humans to Mars. Water has a number of important uses for us. At t

发表于:2019-01-02 / 阅读(150) / 评论(0)

火星生命

Horizon - Life On Mars 火星生命 - 13

Life on Earth is basically proteins and DNA, so we can wonder if there is life on Mars will also be DNA and proteins, the same type of DNA, the same type of proteins. One might think that DNA is such

发表于:2019-01-02 / 阅读(141) / 评论(0)

火星生命

Horizon - Life On Mars 火星生命 - 12

But there was something even better. Odyssey may not just have found ice. There may also be liquid water, and that means, there could be living creatures there too. Right now, there might be liquid wa

发表于:2019-01-02 / 阅读(164) / 评论(0)

火星生命

Horizon - Life On Mars 火星生命 - 10

But they never got there. The first disappeared into deep space. Another missed its target when its coordinates were confused. One NASA control center was working in metric, the other in feet and inch

发表于:2019-01-02 / 阅读(172) / 评论(0)

火星生命

Horizon - Life On Mars 火星生命 - 9

The ground here is permafrost, a mixture of soil and ice frozen together. A group of Russian scientists have teamed up with NASA to drill down into it in search of microorganisms. It's work that's bee

发表于:2019-01-02 / 阅读(168) / 评论(0)

火星生命

Horizon - Life On Mars 火星生命 - 11

One of these wavelengths corresponds to hydrogen, another wavelength would be iron. Another wavelength would be oxygen. And so you go to the part of the spectrum you are interested in and you see you'

发表于:2019-01-02 / 阅读(156) / 评论(0)

火星生命

地道英语对话：Garbage Disposal(2)

A: Tom, are you there? It's Hannah from 4C. B: Hey, Hannah. Long time no hear from. A: My garbage disposal refuses to work. B: What happens when you turn on the switch? A: When I turn on the switch, nothing happens. B: When did you first notice this?

发表于:2019-01-20 / 阅读(147) / 评论(0)

地道英语对话-租房

地道英语对话：Garbage Disposal(4)

A: Hello, Tom? This is Hannah in 4C. B: Hi, Hannah. What can I do for you? A: My garbage disposal went south. B: Does it turn at all? A: There is nothing but silence when I turn on the switch. B: Did it die suddenly? A: It started to make a weird sou

发表于:2019-01-20 / 阅读(126) / 评论(0)

地道英语对话-租房

地道英语对话：Garbage Disposal(5)

A: Hi, Tom. This is Hannah calling. B: Hi, Hannah. What's up? A: I think my garbage disposal kicked the bucket. B: Is it dying, or is it dead? A: Turning on the switch is the same as not turning on the switch. B: Did it make strange sounds before it

发表于:2019-01-20 / 阅读(133) / 评论(0)

地道英语对话-租房

地道英语对话：Garbage Disposal(1)

发表于:2019-01-20 / 阅读(142) / 评论(0)

地道英语对话-租房

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