雅思听力在考试中占据着重要的地位，时常用听力材料来磨耳朵可以不断巩固大脑的英语语言能力。以下是雅思听力材料，您可以结合MP3和下方的原文及翻译进行听力学习。

听力原文及翻译

One of the key moments in the development of migration theory came in 1822, when a white stork was shot in Germany. This particular stork made history because of the long spear in its neck, which incredibly had not killed it. Everyone immediately realized this spear was definitely not European; it turned out to be a spear from a tribe in Central Africa. 

1822年，一只白鹳在德国被射杀，这是迁徙理论发展的关键时刻之一。这只鹳因脖子上插着一根长矛而载入史册，但令人惊奇的是，这根长矛并没有杀死它。每个人都立即意识到这根长矛绝对不是欧洲的；原来是来自中非一个部落的长矛。

This was a truly defining moment in the history of ornithology, because it was the first evidence that storks spend their winters in sub-Saharan Africa. You can still see the arrow stalk in the zoological collection of the University of Rostock in Germany. People gradually became aware that European birds moved south in autumn and north in summer, but didn't know much about it until the practice of catching birds and putting rings on their legs became established. 

这是鸟类学历史上真正具有决定性意义的时刻，因为它是鹳在撒哈拉以南非洲过冬的第一个证据。你仍然可以在德国罗斯托克大学的动物学收藏中看到这根箭柄。人们逐渐意识到欧洲鸟类在秋天向南迁徙，夏天向北迁徙，但直到捕捉鸟类并在它们腿上戴环的习俗形成后，人们才对此有了更多的了解。

Before this, very little information was available about the actual destinations of particular species and how they traveled there. People speculated that larger birds provided a kind of taxi service for smaller birds, by carrying them on their backs. This idea came about because it seemed impossible that small birds weighing only a few grams could fly over vast oceans. 

在此之前，关于特定物种的实际目的地以及它们如何到达那里的信息非常少。人们推测，较大的鸟类通过将较小的鸟类背在背上，为较小的鸟类提供了一种出租车服务。这个想法的产生是因为体重只有几克的小鸟似乎不可能飞越浩瀚的海洋。

This idea was supported by observations of bird behavior, such as the harassment of larger birds by smaller birds. The development of bird ringing by a Danish schoolteacher, Hans Christian Cornelius Mortensen, made many discoveries possible. This is still common practice today and relies upon what is known as recovery – this is when ringed birds are found dead in the place they have migrated to and identified. 

这个想法得到了鸟类行为观察的支持，例如小鸟骚扰大鸟。丹麦教师 Hans Christian Cornelius Mortensen 发明了鸟类环志，使许多发现成为可能。这在今天仍然是常见的做法，依赖于所谓的恢复——即在它们迁徙到的地方发现被环志的鸟死亡并被确认身份。

Huge amounts of data were gathered in the early part of the 20th century, and for the first time in history, people understood where birds actually went to in winter. In 1931, an atlas was published showing where the most common species of European birds migrated to. 

20 世纪初期收集了大量数据，人们有史以来第一次了解了鸟类在冬天实际上去了哪里。1931年，出版了一本地图集，展示了最常见的欧洲鸟类迁徙到哪里。

以上就是本期的雅思听力练习，希望对您的听力水平有所帮助。您也可以访问网站主页，获取最新的英语学习资料，全方位提升英语能力。还可以加入听力课堂官方QQ群（243171310），与英语学习者共同交流！