The black-market price of petrol is now 30 times more than the official rate at petrol stations, where drivers wait in mile-long queues for up to a week.

黑市油价现在比加油站公布的油价贵30倍，而在城市中司机要等到长达一周的时间才能加到油，因为队伍往往都有一公里长。

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This, however, may push others towards the black market or offshore, further undermining the credibility of the official exchange rate.

然而这会使其它人走向黑市或海外市场，这样就会更加削弱官方汇率的可信度。

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On the black market the pound is trading as much as 60 percent below the official rate.

在黑市上，苏丹磅兑换交易比官方汇率低60%之多。

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This action targets those people that have been using credit cards as a way to purchase at the official rate rather than the black market rate, in effect creating a dual credit card exchange regime.

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Now, all foreign currencies must be changed at commercial banks at the official rate, barely a third of the black-market rate.

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But the black-market rate determines the prices of everything from beer to school fees.

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