"赤字都快接近GDP总量的美国,却数十年如一日地享有AAA的最高评级"--I would not surprise due to political reasons (who is the No. 1 in this planet, and who is the game rule maker?--US). Frankly speaking, US Debt is still the most welcome debt so far no matter how bad its economy performs because there are always some others worse than US (i.e. Europe and Japan). However, as you said, what surprise me is the rating of Spain--现在还深陷主权债麻烦的西班牙,信用评级居然比中国高很多,而且是最高的AAA级!Really, unbelievable! I think the ranking produced by those western institution have already biased (to protect the economic standing of European Union, who knows?)