When will the single currency be operable?

什么时候实行单一货币？

A single currency was accepted as the logical extension to removal of these trade barriers.

单一货币被认为是消除这些贸易壁垒的逻辑延伸。

If the Gulf states move to a single currency, as they plan to in the next few years, that currency should surely float.

如果这些海湾国家打算实行单一货币，就像他们在未来几年中计划的那样，那么这种货币也必将是可浮动的。

There should be a single currency for the world.

全球应该只流通一种货币。

How, then, will Europe try to save its single currency?

接下来，欧盟能否拯救它的单一货币呢？