托福听力精听讲解（30）

来源：广州从化区新东方雅思托福培训时间：2022/12/16 11:00:28

　　为同学们整理了托福听力精听讲解整理，供考生参考学习。

　　听力填空

　　回复填空答案格式如下：1____2____3____...et.al.

　　The winds of a tornado are the most violent and ______ ones on Earth. Any of you who have seen one knows very well how frightening and powerful they are. What's interesting about them is that scientists don't actually know exactly why _______ occur. We do know, however, what happens when tornadoes are formed.

　　As you remember, a front occurs when cool, dry air from the north meets warm, humid air coming from the south (from the Gulf of Mexico, for tornadoes in the United States). Where these air masses meet, a narrow zone of storm clouds develops,and _______, and sometimes tornadoes, occur. How is this violent weather produced? Well, a mass of warm, humid air rises very rapidly.

　　As it rises, more warm air rushes in to replace it. This inrushing air also rises, and in some cases, especially when there is extreme ______ instability, begins to ______. When this happens, the rotating air forms a tornado. Even if you've seen tornadoes only in movies, you know that they can demolish buildings in seconds.

　　This is possible because when a tornado passes over a house, it sucks up air from around the house and so the air pressure outside the house drops rapidly. Inside, pressure remains the same. So, air pressure inside is greater than air pressure outside.

　　The result is that the building explodes outward. Next, we'll talk a little bit about how new technological developments are being used to try to predict tornadoes.【填空答案】1.destructive adj. 破坏的;毁灭性的;有害的，消极的2.tornadoes n. 龙卷风(tornado的复数)3.thunderstorms n. 雷暴;雷雨(thunderstorm的复数);雷暴雨4.thermal adj. 热的，热量的5.rotate vt. 使旋转;使转动;使轮流

　　【听力原文】

　　The winds of a tornado are the most violent and destructive ones on Earth. Any of you who have seen one knows very well how frightening and powerful they are. What's interesting about them is that scientists don't actually know exactly why tornadoes occur. We do know, however, what happens when tornadoes are formed.

　　As you remember, a front occurs when cool, dry air from the north meets warm, humid air coming from the south (from the Gulf of Mexico, for tornadoes in the United States). Where these air masses meet, a narrow zone of storm clouds develops,and thunderstorms, and sometimes tornadoes, occur. How is this violent weather produced?

　　Well, a mass of warm, humid air rises very rapidly. As it rises, more warm air rushes in to replace it. This inrushing air also rises, and in some cases, especially when there is extreme thermal instability, begins to rotate. When this happens, the rotating air forms a tornado. Even if you've seen tornadoes only in movies, you know that they can demolish buildings in seconds.

　　This is possible because when a tornado passes over a house, it sucks up air from around the house and so the air pressure outside the house drops rapidly. Inside, pressure remains the same. So, air pressure inside is greater than air pressure outside.

　　The result is that the building explodes outward. Next, we'll talk a little bit about how new technological developments are being used to try to predict tornadoes.精解译文

　　【听力精解】这是一篇自然科学的文章，讲龙卷风的形成，好像对于中国的学生比较陌生，因为好像美国比较常发生龙卷风灾害，中国较多也就是东南角刮刮台风什么的。

　　这里面用的词基本还比较好理解，听写里的词汇没有特别难听出的，在这里重点讲几个生词。inrushing air 意思是流入，涌入的空气extreme thermal instability 讲到这里是在说热量差的不稳定，导致了气流的旋转demolish 听到这个词，要想到devastate 都是破坏毁坏的意思

　　【参考译文】

　　龙卷风的风速是地球上较暴力和破坏性的。任何你已经看到了一个多么可怕和强大，他们非常清楚。什么是他们感兴趣的是，科学家们实际上并不确切地知道为什么龙卷风的发生。

　　然而，我们知道发生了什么当龙卷风的形成。你还记得，前面发生时，从北部的凉爽干燥的空气满足温暖，潮湿的空气从南(从墨西哥湾，在美国的龙卷风)。这些气团相遇，狭窄的风暴云区的发展，雷暴，有时龙卷风发生。这种暴力的天气是如何产生的?好，温暖，潮湿的空气质量上升非常迅速。因为它上升，更温暖的空气冲进来取代它。

　　这突涌的空气也上升，在某些情况下，特别是当有极端热不稳定，开始旋转。当这种情况发生，旋转空气形成龙卷风。即使你只在电影里见过的龙卷风，你知道，他们可以在几秒钟内拆除的建筑物。

　　这是可能的，因为当龙卷风在一所房子时，它吸收了房子周围的空气，所以在屋外的空气压力迅速下降。内，压力保持不变。因此，空气内压力大于空气压力外。其结果是，大楼爆炸向外。下一步，我们将谈论如何正在使用新技术的发展，试图预测龙卷风一点点。

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