美国长期停滞或出现更加糟糕的情况将使全球需求和增长失去一个主要的来源。

Prolonged stagnation, or worse, in the United States would turn off one of the main sources of global demand and global growth.

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然而现实中，一些国家和地区的经济在遭受短期性冲击后，却长期地陷入停滞或缓慢增长的困境中。

In fact, however, some countries and areas sank into long recessions or slow growth after suffering short-run shock.

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