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第一段

1 .Last week, we started looking at reptiles, including crocodiles and snakes.

上周我们学习了爬行动物,包括鳄鱼和蛇。

2 .Today, I'd like us to have a look at another reptile - the lizard

今天,让我们一起学习一下另外一种爬行动物--蜥蜴

3 .- and in particular, at some studies that have been done on a particular type of lizard whose Latin name is tiliqua rugosa.

尤其是一种拉丁名为"松果蜥"的蜥蜴,有很多研究都研究了这种蜥蜴。

4 .This is commonly known as the sleepy lizard,

这种蜥蜴的更为人熟知的名字就是"睡眠蜥蜴",

5 .because it's quite slow in its movements and spends quite a lot of its time dozing under rocks or lying in the sun.

因为它运动非常缓慢,而且花很长时间在岩石下面打瞌睡,或者是在太阳下躺着。

第二段

1 .I'll start with a general description.

我想从概述开始。

2 .Sleepy lizards live in Western and South Australia, where they're quite common.

睡眠蜥蜴住在澳大利亚西部和南部,它们在那里很常见。

3 .Unlike European lizards, which are mostly small, green and fast-moving,

不同于大多数体型都很小、身体是绿色并且运动迅速的欧洲蜥蜴,

4 .sleepy lizards are brown,

睡眠蜥蜴是棕色的,

5 .but what's particularly distinctive about them is the colour of their tongue,

但是它们非常特殊的一点在于他们舌头的颜色,

6 .which is dark blue,

是暗蓝色的,

7 .in contrast with the lining of their mouth which is bright pink.

和他们亮粉色的嘴边形成了鲜明对比。

8 .And they're much bigger than most European lizards.

而且它们比欧洲蜥蜴大很多。

9 .They have quite a varied diet, including insects and even small animals,

他们的饮食相当多样化,包括昆虫,甚至小动物,

10 .but they mostly eat plants of varying kinds.

但是它们主要吃各种各样的植物。

第三段

1 .Even though they're quite large and powerful,

尽管它们很大、很有力量,

2 .with strong jaws that can crush beetles and snail shells,

有着强壮的下颚,可以咬碎甲虫和蜗牛壳,

3 .they still have quite a few predators.

它们仍然有一些捕食者。

4 .Large birds like cassowaries were one of the main ones in the past,

像食火鸡这样的大型鸟类在过去是主要的鸟类之一,

5 .but nowadays they're more likely to be caught and killed by snakes.

但是现在它们更容易被蛇捕杀。

6 .Actually, another threat to their survival isn't a predator at all,

事实上,另一个威胁它们生存的根本不是掠食者,

7 .but is man-made - quite a large number of sleepy lizards are killed by cars when they're trying to cross highways.

而是人为的——很多睡眠蜥蜴在过马路的时候被车压死了。

第四段

1 .One study carried out by Michael Freake at Flinders University investigated the methods of navigation of these lizards.

弗林德斯大学的Michael Freake进行了一项研究,调查了这些蜥蜴的导航方法。

2 .Though they move slowly,

尽管它们运动的很慢,

3 .they can travel quite long distances.

但是能走很长的距离。

4 .And he found that even if they were taken some distance away from their home territory,

而且他发现,即使他们被带到离家很远的地方,

5 .they could usually find their way back home as Iong as they could see the sky

只要能看到天空,他们通常就能找到回家的路

6 .- they didn't need any other landmarks on the ground.

——它们不需要在地上有任何的其他地标。

第一段

1 .Observations of these lizards in the wild have also revealed that their mating habits are quite unusual.

在野外对这些蜥蜴的观察也显示它们的交配习性是非常不寻常的。

2 .Unlike most animals, it seems that they're relatively monogamous,

与大多数动物不同,它们似乎是一夫一妻制,

3 .returning to the same partner year after year.

每年都会回到相同的伴侣那里。

4 .And the male and female also stay together for a long time, both before and after the birth of their young.

而且雌性和雄性也会一起呆很长一段时间,在它们的孩子出生前后。

第二段

1 .It's quite interesting to think about the possible reasons for this.

思考一下(这种情况出现)可能的原因是很有趣的。

2 .It could be that it's to do with protecting their young

可能是为了保护他们的孩子

3 .- you'd expect them to have a much better chance of survival if they have both parents around.

——如果他们的父母都在身边,他们会有更好的生存机会。

4 .But in fact observers have noted that once the babies have hatched out of their eggs,

但事实上,观察者已经注意到,一旦这些婴儿从卵中孵化出来,

5 .they have hardly any contact with their parents.

他们与父母几乎没有任何联系。

6 .So, there's not really any evidence to support that idea.

所以,并没有任何证据支持这个观点。

第三段

1 .Another suggestion's based on the observation that male lizards in monogamous relationships tend to be bigger and stronger than other males.

另一种观点是基于对一夫一妻制关系中的雄性蜥蜴比其他雄性蜥蜴更大更强壮的观察。

2 .So maybe the male lizards stay around so they can give the female lizards protection from other males.

所以雄性蜥蜴可能会留下来保护雌性蜥蜴免受其他雄性蜥蜴的伤害。

3 .But again, we're not really sure.

但同样地,我们也不确定。

第四段

1 .Finally, I'd like to mention another study that involved collecting data by tracking the lizards.

最后,我想提一下另一项通过追踪蜥蜴来收集数据的研究。

2 .I was actually involved in this myself.

我自己也参与其中。

3 .So we caught some lizards in the wild and we developed a tiny GPS system that would allow us to track them,

我们从野外抓了一些蜥蜴,而且开发了一种微型GPS系统能让我们追踪它们,

4 .and we fixed this onto their tails.

我们把GPS系统固定在它们的尾巴上。

5 .Then we set the lizards free again,

然后我们把这些蜥蜴放生,

6 .and we were able to track them for twelve days and gather data,

同时我们对它们进行了长达12天的追踪并收集了数据,

7 .not just about their location,

不仅有它们的位置,

8 .but even about how many steps they took during this period.

甚至在这期间他们走了多少步。

第五段

1 .One surprising thing we discovered from this is that there were far fewer meetings between lizards than we expected

我们从中发现了一件令人惊讶的事情,蜥蜴之间的接触比我们预想的要少得多

2 .- it seems that they were actually trying to avoid one another.

看起来他们实际上是在互相回避。

3 .So why would that be?

为什么会这样呢?

4 .Well, again we have no clear evidence,

我们也没有明确的证据,

5 .but one hypothesis is that male lizards can cause quite serious injuries to one another,

但有一种假说认为雄性蜥蜴会对彼此造成非常严重的伤害,

6 .so maybe this avoidance is a way of preventing this

所以这种回避可能是一种防止这种伤害的方法

7 .-of self-preservation, if you like.

——或者是自保的方式。

8 .But we need to collect a lot more data before we can be sure of any of this.

但是我们需要收集更多的数据才能确定这些。