### Chinese: 9月7日，中美洲小国萨尔瓦多将比特币定为法定货币，这是比特币第一次成为一个国家或地区的法定货币。
### English: On September 7th, El Salvador, a small Central American country, designated bitcoin as legal tender. This is the first time bitcoin has become the legal currency in a country or region.
### Errors: There is no error in the English translation.

### Improved English: On September 7, the small country, El Salvador, in Central America designated bitcoins as a legal tender, and this is the first time that bitcoin has become the legal tender of a country or region.
