英语听力：自然百科 行星旅行：土星 Saturn—15

In fact, as we took radar¹ pictures of other parts of Titan, we found even wilder things in the northern polar areas. There are entire lakes, or even seas, that look/ to all the world like you could go take a boat and go do jet skiing or something, right, you know, up and down these sea channels there.

Titan is the only other place in the solar system that we know liquids exist on the surface. So here you have vast reservoirs of liquid natural gas and oh, by the way, we have thrown in some ethane, which is slightly more complex hydro-carbonate, oh, by the way, there are some propane in there. Everybody knows what propane is, you use it in your backyard barbeque. 

Cassini's radar spied / lakes as biggest inland seas, even bigger than Lake Superior. Imagine standing² on the shoreline of what to you looks like an ocean of liquid hydrocarbons³. That's gotta be pretty special. 

And if you think the lakes are weird⁴, try the volcanoes.

We think the material that comes out of Titanian volcanoes is a mixture of ammonia and water, which allows water to melt at a much lower temperature. This is lava⁵ on Titan, a stinky mix of water and ammonia, molten at minus 150 degrees.

You can build anything from small cones⁶ to large mountains on Titan, out of this stuff.

If you were a visitor and you walked up and you put your hand on a lava flow, you wouldn't burn your hand, you would freeze it.

In stark⁷ contrast to the cryovolcanoes and wet polar lake lands, bordering the equator are vast Titanian deserts, covered in dunes⁸.

I think it would be one of the seven wonders of the solar system, what you would see is almost unending sea of massive dunes, exactly the same size and scale of dunes that we see on earth, some areas where you see nothing, but dunes for hundreds and hundreds of kilometers

1 radar   

n.雷达，无线电探测器

参考例句：

• They are following the flight of an aircraft by radar.他们正在用雷达追踪一架飞机的飞行。
• Enemy ships were detected on the radar.敌舰的影像已显现在雷达上。

2 standing   

n.持续，地位；adj.永久的，不动的，直立的，不流动的

参考例句：

• After the earthquake only a few houses were left standing.地震过后只有几幢房屋还立着。
• They're standing out against any change in the law.他们坚决反对对法律做任何修改。

3 hydrocarbons   

n.碳氢化合物，烃( hydrocarbon的名词复数 )

参考例句：

• Hydrocarbons (HC), like carbon monoxide, represent unburned and wasted fuel. 碳氢化合物(HC)像一氧化碳一样，为未燃尽的和被浪费掉的燃料。 来自英汉非文学 - 环境法 - 环境法
• With this restricted frequency range it is not applicable to hydrocarbons. 这个较紧缩的频率范围不适用于烃类。 来自辞典例句

4 weird   

adj.古怪的，离奇的；怪诞的，神秘而可怕的

参考例句：

• From his weird behaviour,he seems a bit of an oddity.从他不寻常的行为看来，他好像有点怪。
• His weird clothes really gas me.他的怪衣裳简直笑死人。

5 lava   

n.熔岩，火山岩

参考例句：

• The lava flowed down the sides of the volcano.熔岩沿火山坡面涌流而下。
• His anger spilled out like lava.他的愤怒像火山爆发似的迸发出来。

6 cones   

n.（人眼）圆锥细胞；圆锥体( cone的名词复数 )；球果；圆锥形东西；（盛冰淇淋的）锥形蛋卷筒

参考例句：

• In the pines squirrels commonly chew off and drop entire cones. 松树上的松鼠通常咬掉和弄落整个球果。 来自辞典例句
• Many children would rather eat ice cream from cones than from dishes. 许多小孩喜欢吃蛋卷冰淇淋胜过盘装冰淇淋。 来自辞典例句

7 stark   

adj.荒凉的；严酷的；完全的；adv.完全地

参考例句：

• The young man is faced with a stark choice.这位年轻人面临严峻的抉择。
• He gave a stark denial to the rumor.他对谣言加以完全的否认。

8 dunes   

沙丘( dune的名词复数 )

参考例句：

• The boy galloped over the dunes barefoot. 那男孩光着脚在沙丘间飞跑。
• Dragging the fully laden boat across the sand dunes was no mean feat. 将满载货物的船拖过沙丘是一件了不起的事。