Even though these economies are only just starting to feel the upturn, policymakers now face a difficult problem: how to sustain a robust recovery without blowing up bubbles.

尽管这些经济体的经济刚开始好转，但政策制定者现在面临难题：在避免经济泡沫的情况下如何保持经济的强劲反弹。

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The problem is that all they're doing is blowing up conventional movies on to a larger screen.

CNN: Special-effects master pushes new movie format