在托福听力的过程中，转折关系必不可少。因此充分理解听力的转折原则对于深入的理解听力至关重要，那么在实际的做题过程中我们应该如何运用转折原则呢?本篇文章小编就为大家分享托福听力转折原则案例解析，帮助考生学会运用转折原则。

　　转折原则的特点

　　转折原则是在听听力段子的时候要特别注意那些含有转折含义的词或结构。因为无论是讲座还是听力对话，有转折的地方永远都会有考点。在听力的段子中只要有转折就说明作者就要转向另一层含义，往往转折后面的句子就是考点。表示转折的信号词有but/however/nevertheless/while/yet/unless/except for/actually/in fact/to tell you the truth/practically/virtually/as a matter of fact .

　　运用转折原则的案例

　　例1. TPO17 lecture 1第2题

　　According to the professor, when might stratigraphy provide misleading information about a portable object?

　　A. When the object has decomposed over time.

　　B. When the object is older than the site at which it was found.

　　C. When the object is found in the lowest soil layer of a site.

　　D. When the object was broken during excavation.

　　首先，定位原文。根据题目中提到的a portable object可以定位原文，That would be stratigraphy. Stratigraphy is used for dating portable art. When archaeologists are digging at a site, they make very careful notes about which stratum(strata), which layer of earth they find things in. And, you know, the general rule is that the oldest layers are at the lowest level. But this only works if the site hasn’t been touched, and the layers are intact. A problem with this dating method is that an object could have been carried around, used for several generations before it was discarded. So it might be much older than the layer or even the site where it was found.

　　其次，根据内容进行分析。But this only works， But(转折关系的信号词)表明stratigraphy 的适用是有条件的，只有该地未被动过时，用此方法测试时准确的。A problem with this dating method说明说这个方法的缺陷，被挖出来的物品很可能在它被丢弃在这里之前就已经被使用了很长一段时间了。it might be much older所以挖出来的物品可能比掩埋的土层时间更久远。Stratigraphy 只能告诉我们物品至少有多少年历史，而不是它真正的年代。因此出现物品可能比掩埋的土层时间更久远时候就会出现错误的信息。因此答案为B选项。

　　最后，从上面的题目分析的过程中，我们可以发现，解题的关键就在but之后，因此我们可以知道转折类的信号词在文章中所起的作用，转折类的信号词既是提醒考生这是重点也是告诉考生这里要集中注意力进行听。因此小编建议考生能够在记笔记的时候充分利用转折列的信号词，记录关键信息进行答题，提高正确率。

　　例2，TPO17 lecture 1第4题所对应的原文中如下，While a lack of detail suggests a primitive style. But trends in art in the last century or so certainly challenge that idea. Don’t get me wrong though, analyzing the styles of prehistoric art can help dating them. But we need to be careful with the idea that artistic development occurs in a straight line, from simple to complex representations.

　　本段的内容主要说的是对某一种史前艺术品的类型或者发展状态，我们可能有各种各样的先入为主的成见。比如说，很多人认为精细的文物只可能是出自熟练的工匠之手，而粗糙、缺乏精细度的作品的时代则可能比较原始。But trends in art in the last century or so certainly challenge，从上个世纪甚至早些的艺术趋势来看，这种观念受到了挑战。分析史前文物当然可以帮助我们确定它的时代。But we need to be careful with the idea that artistic development occurs in a straight line,但是我们必须要摒除艺术品单线发展，即所有艺术品都是从原始到复杂，从粗糙到精细这样的成见。

　　因此题目中说到对于通过艺术风格判断艺术品的年代，教授是什么态度，文章中用两个转折信号词but表明作者对这种断代方法感到疑惑。因此可以看出转折类的信号词对于听力的答题和文章的理解来说都有很大的作用。

　　以上就是托福听力转折原则案例解析的相关内容，希望通过上面的分析能帮助大家备考。

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