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In this log-scale plot, I also included a diagonal line that represents error values decreasing with the square of the denominator (1/b²). Approximations for which the error dips below this line would be markedly better than the ones that merely dip below 1/b. We can label these 1/b² solutions as 2-good.
，这一点在PDF资料中也有详细论述
North Korean media have released pictures of Ju Ae shooting a sniper rifle with her father
«Европа бьет сама по себе». Страну НАТО заподозрили в организации атаки на российский газовоз. Новые подробности атаки на судно20:45
南方周末记者注意到，广西、内蒙古、云南、江西、湖南等多个中西部省份都在未来五年的规划建议中提出，要积极有序承接来自邻近经济发达省份或是对口帮扶、支援省份的产业实现梯度转移。