In part because, while the NAIRU and the output gap are nice ideas, it is often hard to agree, at any given moment, on the valueof either number.
部分原因在于，虽然自然生产率和经济产出缺口是一个很不错的想法，但往往难以随时使两者数值匹配。
2
One key indicator of the valueof any research is the number of times it is quoted by other scientists in their work.
任何研究的价值的一个关键指标是它被其他科学家在他们的工作中引用了多少次。
3
According to a popular saying the valueof life is not measured in the numberof years, the same way the valueof a trip is not calculated by the number of destinations!