中文：

GDP是指国内生产总值，它是一个国家或地区在一定时期内，由国内生产活动创造的最终产品和服务的市场价值。GDP是衡量一个国家或地区经济规模和发展的重要指标，也是国际间比较经济实力的重要参照。

GDP的计算方法有三种，分别是生产法、收入法和支出法。生产法是从生产过程中生产的货物和服务总产品价值入手，剔除生产过程中投入的中间产品的价值，得到增加值总额，再将其累加得到GDP。收入法也称分配法，是将生产过程汇总中各种要素所有者得到的收入汇总起来，剔除生产过程中投入的中间产品的价值，得到增加值总额，再将其累加得到GDP。支出法也称最终消费法，是从最终消费的角度出发，将最终消费支出加总起来，剔除生产过程中投入的中间产品的价值，得到增加值总额，再将其累加得到GDP。

GDP是宏观经济政策的重要指标之一，对于国家和社会的发展具有重要的意义。然而，GDP也存在一些问题，例如不能反映资源的浪费和环境破坏等负面因素。因此，在利用GDP时需要综合考虑其优缺点，并与其他指标一起使用，以更好地评估经济发展和社会进步。

英文：

GDP refers to Gross Domestic Product, which is the total market value of final goods and services produced within a country or region during a certain period of time. GDP is an important indicator to measure the economic size and development of a country or region, and also an important reference for comparing economic strength internationally.

There are three methods of calculating GDP: production method, income method and expenditure method. The production method starts with the total value of goods and services produced in the production process, subtracts the value of intermediate products input in the production process, obtains the total value-added, and then adds it up to get GDP. The income method, also known as the distribution method, sums up the income received by various factors of production in the production process, subtracts the value of intermediate products input in the production process, obtains the total value-added, and then adds it up to get GDP. The expenditure method, also known as the final consumption method, starts from the perspective of final consumption, adds up the total amount of final consumption expenditure, subtracts the value of intermediate products input in the production process, obtains the total value-added, and then adds it up to get GDP.

GDP is one of the important indicators of macroeconomic policies, and it is of great significance for the development of a country and society. However, GDP also has some problems, such as not reflecting resource waste and environmental damage. Therefore, when using GDP, we need to consider its advantages and disadvantages comprehensively and use it together with other indicators to better evaluate economic development and social progress.