这是因为一个经济体的趋势增长率不能直接被测算。
That is because an economy's trend growth rate cannot be measured directly.
在70年代早期，因为一些至今仍无法明确的原因，生产率增长大幅下降，使得趋势增长率也随之下降。
In the early 1970s, for reasons that are still ill-understood, productivity growth slowed sharply, pulling down the trend rate of growth.
在重建库存和经济刺激支出的推动之下，全球GDP会有几个月的强劲增长，但之后便会回落到趋势增长率之下。
After a few months of vigour, largely driven by restocking and stimulus spending, global GDP growth will weaken to below its trend rate.
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