When will the single currency be operable?

什么时候实行单一货币？

《牛津词典》

As well as those chronic problems, the EU faces an acute crisis in its economic core, the 16 countries that use the single currency.

除了这些长期的问题之外，欧盟的经济核心——16个使用单一货币的国家——也面临着严重的危机。

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The cost of breaking up the single currency would be enormous.

打破单一的货币体系将会付出巨大的代价。

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The single currency has also been forcing eurozone governments to embark on a programme of structural reform.

BBC: The euro: Still in the doldrums

The single currency direction this morning has mostly been influenced by cross currency plays.

FORBES: The Yen's Slow And Methodical Drop

Second, they are losing confidence in the single currency and Spain's place within it.

ECONOMIST: Why the rescue plan for Spain is not enough