求翻译：The V8 Mercedes-Benz GL-Class has below average reliability ratings for both model years of its 2-year 2010 data history, the 6-cylinder BMW X5 has below average ratings for 7 of its 9-year reliability history, and the all-wheel-drive Buick Enclave has one below average rating in its 2-year data history. The Lexus GX has one below average rating, but the remaining 5 ratings are above average and one is Much-Better-Than-Average. Consequently, as one descends on this list, longer-term reliability seems to improve with predicted short-term reliability.是什么意思？

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