随著外币资产累积，对升值的预期也将提高，甚至使将货币汇率压低的成本更高。
As the stock of foreign currency accumulates, speculation on an appreciation rises, making it ever more costly to hold the currency down.
美元兑主要货币汇率继续走强，尤其是兑日元和欧元。而因美联储下调美国经济增长预期以及没有表示进一步的刺激计划，原油和大宗商品价格双双受挫。
The Dollar strengthened against the majors, especially the Yen and Euro while oil and commodities declined after the Fed cut estimates for us economic growth and didn't signal further stimulus.
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