在我看来，在不少重要国家，包括意大利、美国和中国，都存在一个相对有利的情景和一个悲观得多的情景，其间的差别大体上就在于政策反应的有效性。
It seems to me that in several important cases, including Italy, the US, and China, there is a relatively favorable scenario and a much less attractive one, distinguished largely by the effectiveness of the policy responses.