### 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 7, the small Central American country of El Salvador designated bitcoin as legal tender, which is the first time <v>bitcoin</v> has become the legal tender of a country or region.
### Errors: There is a minor fluency/spelling error at "bitcoin" within <v></v>.

### 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.
