中国只有在以按市场汇率兑换的美元来计算，其GDP也超过了美国时，美国才算真正黯然失色。
And America will only really be eclipsed when China's GDP outstrips it in plain dollar terms, converted at market exchange rates.
他表示，苏丹必须降低进口以减轻苏丹镑的压力，苏丹镑兑换美元的汇率已经下跌。
He said Sudan would have to lower imports to reduce pressure on the Sudanese pound, which has tumbled against the dollar.
事实上，尼克松在8月15日宣布，美国不再履行无力承担的义务，即美元以固定汇率兑换成黄金。
On August 15th Nixon, in effect, announced that America was now unwilling to do what it would soon be incapable of doing-converting dollars into gold at the agreed exchange rate.
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