托福听力短文 I-05-3
时间：2018-12-05 作者：英语课 分类：托福听力短文
(man) I'm glad you brought up the question of our investigations 1 into the makeup 2 of the Earth's interior. In fact --- since this is the topic of your reading assignment for next time --- let me spend these last few minutes of class talking about it. There were several important discoveries in the early part of this century that helped geologists 4 develop a more accurate picture of the Earth's interior.
The first key discovery had to do with seismic 5 waves --- remember they are the vibrations 6 caused by earthquakes. Well, scientists found that they traveled thousands of miles through the Earth's interior. This finding enabled geologists to study the inner parts of the Earth. You see, these studies revealed that these vibrations were of two types: compression --- or P --- waves and shear 7 --- or S --- waves. And researchers found that P waves travel through both liquids and solids, while S waves travel only through solid matter.
In 1906 a British geologist 3 discovered that P waves slowed down at a certain depth but kept traveling deeper. On the other hand, S waves either disappeared or were reflected back, so he concluded that depth marked the boundary between a solid mantle 8 and a liquid core. Three years later another boundary was discovered --- that between the mantle and the Earth's crust.
There's still a lot to be learned about the Earth. For instance, geologists know that the core is hot. Evidence of this is the molten lava 9 that flows out of volcanoes. But we're still not sure what the source of the heat is.
- His investigations were intensive and thorough but revealed nothing. 他进行了深入彻底的调查，但没有发现什么。
- He often sent them out to make investigations. 他常常派他们出去作调查。
- Those who failed the exam take a makeup exam.这次考试不及格的人必须参加补考。
- Do you think her beauty could makeup for her stupidity?你认为她的美丽能弥补她的愚蠢吗？
- The geologist found many uncovered fossils in the valley.在那山谷里，地质学家发现了许多裸露的化石。
- He was a geologist,rated by his cronies as the best in the business.他是一位地质学家，被他的老朋友们看做是这门行当中最好的一位。
- Geologists uncovered the hidden riches. 地质学家发现了地下的宝藏。
- Geologists study the structure of the rocks. 地质学家研究岩石结构。
- Earthquakes produce two types of seismic waves.地震产生两种地震波。
- The latest seismic activity was also felt in northern Kenya.肯尼亚北部也感觉到了最近的地震活动。
- We could feel the vibrations from the trucks passing outside. 我们可以感到外面卡车经过时的颤动。
- I am drawn to that girl; I get good vibrations from her. 我被那女孩吸引住了，她使我产生良好的感觉。 来自《简明英汉词典》
- Every spring they shear off the sheep's wool and sell it.每年春天他们都要剪下羊毛去卖。
- In the Hebrides they shear their sheep later than anywhere else.在赫伯里兹，剪羊毛的时间比其他任何地方都要晚。