中文：

USD是United States Dollar的缩写，即美元，是美国的官方货币。USD也常被称为“美金”，是世界上使用最广泛的货币之一。

美元的发行是由美国联邦储备系统控制的，该系统负责维护经济的稳定和持续增长。USD的符号是$，在财务和商业交易中广泛使用。

由于美元是全球主要的储备货币之一，它对全球经济有着重大影响。美国政府和中央银行会密切关注美元的价值，以确保其符合美国的国家利益。

除了在美国本土使用外，美元也在全球许多国家和地区广泛使用。它是世界上主要的贸易货币之一，也是许多国家和地区的储备货币。

英文：

USD stands for United States Dollar, which is the official currency of the United States. USD is also commonly known as "American dollars", and it is one of the most widely used currencies in the world.

The issuance of USD is controlled by the Federal Reserve System of the United States, which is responsible for maintaining economic stability and sustainable growth. The symbol of USD is $, which is widely used in financial and business transactions.

As one of the major reserve currencies in the world, the USD has a significant impact on the global economy. The US government and central bank closely monitor the value of the USD to ensure it is in line with US national interests.

In addition to being used in the United States, the USD is also widely used in many countries and regions around the world. It is one of the main trading currencies in the world and is also a reserve currency for many countries and regions.