『新东方在线托福口语』为托福考生准备了ETS托福TPO/Official 49 Task 4口语练习：&nbsp;
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<br>&nbsp原文题目答案解析，TPO/Official 49 Task 4口语原文范文音频翻译。

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旁白：听生物课上讲座的一部分。

Narrator: Listen to part of a lecture in a Biology class.

许多动物和它们的同类生活在一起，

many animals live in groups with others of their species,

群居生活有好处，它可以帮助动物生存。

and there are benefits to living together in groups, it can help animals survive.

But there are also certain disadvantages.

今天我们要讲的是群居的两个缺点。

So today we're going to talk about two disadvantages of living in groups for animals.

一个缺点是，群居动物可能更容易被捕食者看到。

One disadvantage is that animals that live in groups may be more visible to predators.

捕食者更有可能发现它们，而不是一个单独的动物。

predators are more likely to spot them than they would an individual animal on its own.

所以有时群居的动物可能更容易被捕食者捕获。

So sometimes animals in groups may be more vulnerable to being captured by predators.

For instance, sardines, really small fish,

群体活动，其他更大的海洋动物，

swim in groups, and other larger ocean animals,

比如某些种类的鲸鱼，吃它们。

虽然鲸鱼可能不会注意到一条沙丁鱼，

So while a whale probably wouldn't notice one sardine,

但它能很容易地看到一群沙丁鱼，这样就能捕捉它们作为食物。

it'd see a group of sardines very easily and thus be able to capture them for food.

Another disadvantage has to do with caring for the young.

这里有很多年轻幼崽，动物很难找到或识别自己的幼崽。

there are a lot of young animals around and it can be difficult for animals to find or identify their own young.

它们可能最终会照顾其他动物的幼崽。

And they may end up taking care of other animals' young instead.

所以它们自己的孩子可能得不到它们所需要的照顾。

So their own young may not get the care they need.

例如，一些蝙蝠生活在洞穴里，有一种蝙蝠，

For example, some bats live in caves, and with one type of bat,

成千上万的蝙蝠住在同一个洞穴里。

millions of them live together in the same cave.

And with young bats so crowded together in the cave,

母蝙蝠有时很难找到自己的孩子。

it's sometimes hard for a mother bat to find her babies.

所以，当一只母蝙蝠觅食回来喂养她的宝宝时，

So when a mother bat returns from finding food to feed her babies,

它可能会给另一只母蝙蝠的宝宝喂食，

she might end up feeding the babies of another mother bat,

也就是说，它自己的孩子得不到食物。

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<br>Using points and examples from the lecture, explain two disadvantages of living in groups for animals.
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