Uncertainty over the size of the output gap complicates the task of central Banks.

产出缺口不确定，央行任务更头疼。

Can the Money Supply and Output Gap Provide Useful Information for Inflation?

货币和产出缺口能给通货膨胀提供有用的信息吗？

Yet it seems premature to write off the threat as long as a large output gap persists.

但是只要巨大的产出缺口持续存在，把这种威胁一笔勾消的做法就显得不成熟。

Net stimulus of around 3 percent of GDP — not much, when you’ve got a 42 percent output gap.

约占GDP3%的净刺激——不算多，当面对的是一个42%的产出缺口时。

In a March 23 speech, Ms. Yellen cautioned that the output gap may not be fully closed until 2013.

耶伦在3月23日的讲话中警告说产出缺口可能直到2013年才能完全消除。