### 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, Salvador, a small country in Central America, determined to take Bitcoin as the lawful money; this was the first time for Bitcoin to be determined as the lawful money of a country or a region.
### Errors: There is a minor error at "Salvador". There is a minor error at "determined to take Bitcoin as the lawful money". There is a minor error at "determine".

### 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.