The rouble is a petrocurrency. Crude oil is a quarter of Russian exports, the largest component. Brent, still the international benchmark for oil, has risen by a fifth in the past two months. Despite that, Russia’s currency has sunk nearly as much against the dollar. On Monday alone it lost some 2 per cent. One might expect the two to move more in tandem.
卢布是一种石油货币。原油占俄罗斯出口的四分之一，是最大组成部分。仍是国际油价基准的布伦特原油(Brent crude)在过去两个月上涨了五分之一。尽管如此，俄罗斯货币对美元的汇率近乎下跌了相同幅度。卢布仅周一就走低约2%。人们本来也许会预计卢布更加紧密地跟随油价。
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