2019考博英语英汉互译练习：经济学里的需求
经济学里的需求与通常意义上的需求略有不同。例如：不懂经济学的人常常用这个词表示某种产品的需求量。于是，如果价格要下调，人们需要更多该种产品时，那么人们一般会说需求增加。对经济学家来说，需求是一系列价格和此价格所需的一系列相应数量的关系。如果仔细读一下前面的句子，那么需求的数量与需求的差异就应该变得很清楚地了。这一区别常常被混淆，因而，我们都应该意识到并了解二者的区别。
In economics, demand implies something slightly different from the common meaning of the term. The layman, for example, often uses the term to mean the amount that is demanded of an item. Thus, if the price were to decrease and individuals wanted more of the item, it is commonly said that demand increases. To an economist, demand is a relationship between a series of prices and a series of corresponding quantities that are demanded at these prices. If one reads the previous sentences carefully, it should become apparent that there is a distinction between the quantity demanded and demand. The distinction is often a point of confusion and we all should be aware of and understand the dirrerence between these two terms.