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fn ++ " " ++ ln
。关于这个话题，WPS下载最新地址提供了深入分析
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.
Даниэль Левибританский политолог, президент Проекта «США — Ближний Восток»