同学们在学习托福听力的过程中，最头疼的就是句子的理解，尤其是长难句。但是相对于阅读文本来说，听力的问题其实是比较简答的，我们在理解句子的时候基本只要考划分句子的主干成分，配合一些短语搭配就可以了，但是关键是要求我们的反应速度要非常的快，我们现在就具体以TPO中的句子为例，来分析一下长难句。(TPO3-L1)
A good research method, a good way to learn more, is by running a banding study. Banding the birds allows us to track them over their lifetime. It’s been a practice that’s been used by researchers for years.
电子条带捆绑研究是对蜂鸟进一步了解的不错方式。条带绑定有助于我们对蜂鸟进行追踪。多年来研究人员一直在使用这种方法。
In fact, most of what we know about humming birds comes from banding studies, where we capture a humming bird and make sure all the information about it, like its weight and age and length, are all recorded, put into international, an international information database.
其实人类对蜂鸟的了解主要是来源于捆绑研究，它能提高蜂鸟确切的落脚点和其他的信息，比如他的体重年龄和寿命都被记录在案，然后输入在国际信息数据库。
And then we place an extremely lightweight band on one of its legs, well, what looks like a leg, although technically it’s considered part of the bird’s foot.
我们将一个非常轻巧的电子条带绑在蜂鸟的一条腿上，其实它是依附在鸟的脚上的。
Anyway, these bands are perfectly safe, and some humming birds have worn them for years with no evidence of any problems.
不管怎么说，这些条带是绝对安全的。一些蜂鸟带着好几年都不会有问题。
The band is labeled with a tracking number, oh, and there is a phone number on the band for people to call for free, to report a banded bird they’ve found or recaptured.
条带上标有追踪号码，上面还有人们可以免费拨打的电话号码，用来了解这个鸟内法线或被抓的情况。
So when a banded bird is recaptured and reported, we learn about its migration route, its growth, and how long it has been alive, its lifespan. One recaptured bird had been banded almost 12 years earlier – she is one of the oldest humming birds on record.
当绑定的蜂鸟被逮住并且有人告知的时候，我们就会知道她的迁徙路线、她的成长和她的寿命。一只再次被逮住的蜂鸟曾于12年前被绑上条带，这是记录在案的最老的蜂鸟之一。
Another interesting thing we’ve learned is that some humming birds, um, they no longer use a certain route. They travel by a different route to reach their destination.
我们了解到的另一个有意思的事是有些蜂鸟在迁徙时不走寻常路。他们另辟蹊径飞到目的地。
And findings like these have been of interest to biologists and environmental scientists in a number of countries who are trying to understand the complexities of how changes in a habitat affect the species in it.
对于多个国家的研究栖息地变迁对物种影响的复杂性的生物学家和环境科学家来说，这样的发现是很有意义的。
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