As five-stars is the highest rating in most hotel systems, there is no worldwide standard for a "seven-star hotel", neither is it an official classification of quality.

事实上，现在世界上并没有所谓的七星级酒店标准，这也不是任何官方质量的评定，大部分酒店系统的最高打分只到五星。

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Rating agencies massively, suddenly and sharply downgraded products which until then were deemed of the highest quality.

评级公司突然大规模调低了我们一度认为最优质产品的信用等级。

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The prospect of downgrades have also wracked the companies' stocks because a bond insurer without the highest-quality rating would have trouble winning new business.

FORBES: Magazine Article

Virgin America is the highest-quality major airline in the United States, according to the 2013 Airline Quality Rating report, an annual study of airline performance.

FORBES: America's Best Airlines