『新东方在线托福口语』为托福考生准备了ETS托福TPO/Official 12 Task 4口语练习：<img src="/upload/ti/2426000-2427000/2426953/9ec93b93905b4739bf03b3702eedb9e6.jpg">
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 U原文题目答案解析，TPO/Official 12 Task 4口语原文范文音频翻译。

托福TPO/Official 12 Task 4口语原文独立/综合口语题目答案解析-范文音频翻译-新东方托福官方网校手机版

Narrator: Listen to part of a lecture in an Economics class.

教授：当我们谈到对产品的需求时，

Professor: So when we talk about the demand for a product,

我们指的是消费者有多想买它，对吧？

we're referring to how much consumers want to buy it, right?

通常，对产品的需求会受到价格的影响。

And often the demand for a product is influenced by its price.

the less chance that people will want to buy it.

有时，对产品的需求也会受到其他相关产品价格的影响。

Sometimes the demand for a product can also be influenced by the price of other related products.

首先，有一种叫做替代商品的产品。

First, there are those products called substitute goods.

如果产品可以相互替代，那么，

If products can be substituted for one another, then well,

They're similar enough to be interchangeable.

一种商品价格的上涨意味着对另一种商品需求的增加，

And an increase in the price of one means an increase in the demand for the other,

它们几乎都是用于相同的目的。

They're pretty much used for the same purposes.

and you can bake equally well with either.

所以，你看，黄油的价格上涨增加了对人造黄油的需求。

So, you see, an increase in the price of butter increases the demand for margarine.

另一个关于一个产品的价格可以影响另一个产品的需求的例子，是当你有两种产品必须一起使用的时候。

Now another instance where the price of one product can influence the demand of another is... is when you have two products that can't be used without each other.

这些产品，我们称之为补充品，它们是互补的，或者是配套的。

Those products, we call complement goods, they complement or complete each other, if you will.

Like compact discs and compact disc players,

你需要同时两种产品才可以使用。

you need both products in order to use either.

如果任意一种产品的价格上涨，

So if the price of either product increases,

对这两种产品的需求都有可能减少。

And because CDs and CD players complement each other,

同时，对CD播放机的需求也会下降。

what will also happen is that the demand for CD players will go down too.

<img src="/upload/ti/2426000-2427000/2426953/9ec93b93905b4739bf03b3702eedb9e6.jpg">
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 Using the points and examples from the talk, explain how substitute goods and complement goods influence the demand for a particular product.
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