The other unit is the US Dollar, as defined in ISO 4217, the international standard describing three-letter currency codes (" USD "for the US Dollar).

另一个单位是美元，如iso 4217所定义，该国际标准描述了由三个字母组成的货币代码(“USD”代表美元)。

youdao

This year it began to attack the long-time position of the U.S. dollar as the standard currency in international trade, encouraging the use of its currency, the yuan, in trade settlements.

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Actually, the closest the world came to the restoration of the pre-1914 gold standard began with the Roosevelt move in 1934, resuming an international guarantee of the dollar at a fixed price in gold.

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