跟读练习: Cambridge 15 listening (Test-1) (Part-4) - 通过视频学习英语口语

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Part 4.

You will hear a student giving a presentation about a type of tree known as the eucalyptus.

which is common in Australia.

First, You have some time to look at questions 31 to 40.

Now listen carefully and answer questions 31 to 40.

Today, I'm going to talk about the eucalyptus tree.

This is a very common tree here in Australia, where it's also sometimes called the gum tree.

First, I'm going to talk about why it's important.

Then I'm going to describe some problems it faces at present.

Right, well, the eucalyptus tree is an important tree for lots of reasons.

For example, it gives shelter to creatures like birds and bats.

And these and other species also depend on it for food, particularly the nectar from its flowers.

So, it supports biodiversity.

It's useful to us humans too because we can kill germs with a disinfectant made from oil extracted from eucalyptus leaves.

The eucalyptus grows all over Australia, and the trees can live for up to 400 years.

So, it's alarming that all across the country, numbers of eucalyptus are falling because the trees are dying off prematurely.

So, what are the reasons for this?

One possible reason is disease.

As far back as the 1970s, the trees started getting a disease called mundula yellows.

The tree's leaves would gradually turn yellow, then the tree would die.

It wasn't until 2004 that they found the cause of the problem was lime,

or calcium hydroxide, to give it its proper chemical name, which was being used in the construction of roads.

The lime was being washed away into the ground and affecting the roots of the eucalyptus trees nearby.

What it was doing was preventing the trees from sucking up the iron they needed for healthy growth.

When this was injected back into the affected trees, they immediately recovered.

But this problem only affected a relatively small number of trees.

By 2000, huge numbers of eucalyptus were dying along Australia's east coast of a disease known as Bell Minor -associated dieback.

The bell miner is a bird and the disease seems to be common where there are high populations of bell miners.

Again, it's the leaves of the trees that are affected.

What happens is that insects settle on the leaves and eat their way round them, destroying them as they go,

and at the same time they secrete a solution which has sugar in it.

Thank you.

The bell miner birds really like this solution, and in order to get as much as possible,

they keep away other creatures that might try to get it.

So these birds and insects flourish at the expense of other species,

and eventually so much damage is done to the leaves that the tree dies.

But experts say that trees can start looking sick before any sign of bell minor -associated dieback.

So it looks as if the problem might have another explanation.

One possibility is that it's to do with the huge bushfires that we have in Australia.

A theory proposed over 40 years ago by ecologist William Jackson is

that the frequency of bushfires in a particular region affects the type of vegetation that grows there.

If there are very frequent bushfires in a region, this encourages grass to grow afterwards,

while if the bushfires are rather less frequent, this results in the growth of eucalyptus forests.

So, why is this?

Why do fairly frequent bushfires actually support the growth of eucalyptus?

Well, one reason is that the fire stops the growth of other species which would consume water needed by eucalyptus trees. And there's another reason.

If these other quick -growing species of bushes and plants are allowed to proliferate,

they harm the eucalyptus in another way by affecting the composition of the soil and removing nutrients from it.

So some bushfires are actually essential for the eucalyptus to survive,

as long as they are not too frequent. In fact, there's evidence

that Australia's indigenous people practised regular burning of bushland for thousands of years before the arrival of the Europeans.

But since Europeans arrived on the continent, the number of bushfires has been strictly controlled.

Now, scientists believe that this reduced frequency of bushfires to low levels has led to what's known as 'dry' rainforest,

which seems an odd name as usually we associate tropical rainforest with wet conditions.

And what's special about this type of rainforest?

Well?

Unlike tropical rainforest, which is a rich ecosystem, this type of ecosystem is usually a simple one.

It has very thick, dense vegetation but not much variety of species.

The vegetation provides lots of shade, so one species that does find it ideal is the bell -miner bird,

which builds its nests in the undergrowth there.

But again, that's not helpful for the eucalyptus tree.

That is the end of part four.

You now have one minute to check your answers to part four.

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FOR YOU

为什么要用这个视频练习口语？

使用这个视频进行口语练习，不仅可以提高你的听说能力，还能帮助你了解澳大利亚常见的尤加利树。这种树在当地文化和生态中占有重要地位。通过模仿演讲者的发音和语调，你可以提升自己的 雅思口语练习 技能，增强对自然环境相关话题的表达能力。在练习过程中，你会接触到具体的词汇和专业术语，这将提升你的综合语言理解能力。与此同时，观看 看YouTube学英语 的视频，能够让学习过程更加生动有趣，同时也能让你感受到真实的语言使用情境。

语法与表达结构分析

被动语态：例如，“树的叶子逐渐变黄，然后树就会死去。”这里的被动结构强调了动作的结果，而不关注施动者。
现在进行时：如“我今天要谈论尤加利树。”这个时态用来表达当前的动作或计划，能使句子更具生动性。
条件句：例如，“如果火灾发生得比较少，这会导致尤加利森林的生长。”这种结构有助于表达假设和条件关系。

掌握这些表达方式将有助于加深你对英语语法的理解，而在与他人交流时，也能让你表达得更加流畅自然。你可以通过 shadow speak 的方式，反复跟读并内化这些句式，让语言学习变得更高效。

常见发音陷阱

在视频中，一些难以发音的单词包括“尤加利”（eucalyptus）和“蜜蜂鸟”（bell miner）。注意这些词的重音和节奏，避免出现平淡的语调。此外，演讲者的澳大利亚口音可能对非母语者造成一些挑战。模仿这些发音可以帮助你提升自己的发音技巧和听力理解能力，确保在实际交流中能够更好地理解对方的意思。

通过关注并反复练习这些发音，能够有效提升你的口语表达，使你在任何场合下都能自信地展示自己的英语能力。利用 英语影子跟读 的方式，进行跟读和模仿，将你的学习变得更有趣。

视频中的语法

说话人最常用的结构，并附上视频中的原话：

结构	视频中的用法
被动语态 be + 过去分词 — 强调发生了什么，而不是谁做的	being washed · was injected · are affected
定语从句 who / which + 从句 — 补充说明人或事物	name, which was · solution which has · rainforest, which is
现在完成时 have/has + 过去分词 — 过去发生但与现在仍有关联的事	has been · has led

什么是跟读法？

跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。

影子跟读法: 阅读完整分步指南 →

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什么是跟读法？