demand curve的音標是[d??mɑ?nd kru?v]，基本翻譯是需求曲線，速記技巧是“需求”雙立人旁加“曲線”。

Demand curve: The term "demand" comes from the Latin "demandare," which means "to call for" or "to request." The demand curve is a graph that plots the quantity demanded of a good or service against its price. It shows the relationship between price and the amount of goods or services that people are willing to buy.

變化形式: The term "demand curve" has undergone some changes over time. It was originally spelled "demandic," which was later shortened to "demand curve."

相關單詞:

1. Supply curve: This term refers to the graph that plots the quantity supplied of a good or service against its price. It shows the relationship between price and the amount of goods or services that businesses are willing to supply. The two curves, when intersecting, determine the market price of a good or service.

2. Price elasticity: This term refers to the degree to which the quantity of a good or service changes in response to changes in its price. It is measured by comparing the percentage change in quantity to the percentage change in price.

3. Market share: This term refers to the portion of a market controlled by a particular business or brand. It is calculated by dividing a business"s sales or revenue by the total sales or revenue in a particular market.

4. Marginal cost: This term refers to the additional cost incurred by a business or producer for producing one more unit of a good or service. It is important in pricing and decision-making because it affects the profitability of a business.

5. Quantity demanded: This term refers to the amount of a good or service that people are willing to buy at a given price. It is determined by factors such as price, income, taste, and availability of goods and services.

以上這些單詞都與經濟學中的供需關系有關，共同構成了市場決策和價格形成的基礎。

demand curve:

1. 需求曲線

2. 需求曲線向右傾斜

3. 需求曲線反映需求關系

4. 需求曲線上的點表示特定價格下的需求量

5. 需求曲線的形狀取決于價格和產品特性

6. 需求曲線上的移動表示價格變動或消費者偏好的變化

7. 需求曲線的變化反映了市場供需的變化

雙語例句：

1. At this price, the demand curve is steep. 在這個價格下，需求曲線陡峭。

2. The demand curve shifts to the right when the price of the product drops. 當產品的價格下降時，需求曲線向右移動。

3. The demand for this product is influenced by its quality and price. 對這種產品的需求受到其質量和價格的影響。

4. The demand curve for gasoline has shifted to the left due to the recent hurricane. 由于最近的颶風，汽油的需求曲線向左移動。

5. The demand for housing has increased due to the economic recovery. 由于經濟復蘇，對住房的需求增加了。

6. The demand for luxury goods has decreased due to the economic recession. 由于經濟衰退，對奢侈品的需求減少了。

英文小作文：

The demand curve is a key tool in understanding market behavior. It represents the relationship between price and quantity demanded, and it can shift depending on factors such as product quality, price, and consumer preferences. Understanding the shape of the demand curve is essential for businesses seeking to maximize profits and for consumers seeking the best value for their money. However, the demand curve is not a static concept, but rather a dynamic tool that changes over time and in response to market conditions. Therefore, it is important to keep up with market trends and changes in order to make informed decisions and stay ahead of the competition.