also U.S.A., abbreviation of United States of America, in use by 1814 in addresses, etc.; not common otherwise before c. 1920. Before then it often also meant United States Army.
实用例句
1. They swore their allegiance to the USA and received their naturalization papers.
他们起誓忠诚于美国，随后就接到了批准他们入籍的文件。来自柯林斯例句
2. That's a general British failing. In the USA it's quite different.
那是英国人的普遍缺点。在美国，情况就大不一样了。来自柯林斯例句
3. I bought a copy of "USA Today" from a street-corner machine.
我从街角的自动售卖机买了一份《今日美国》。来自柯林斯例句
4. Do you need a visa for the USA?
你需要美国签证吗？来自《权威词典》
5. My plans for going to the USA are on ice for now.
