刚度与质量参数随机时相频特性均值曲线的拐点位置不变，只是拐点附近曲线陡峭度减小。
The position of knee point of Phase-frequency characteristic mean value curve is invariant, but the kurtosis of the curve near the knee point decreases.
通过对拟合方程的估算，预测中国库兹涅茨曲线的拐点大致出现在2010—2015年的时间段内。
Estimated by the regression equations, the inflection point of China's Kuznets curve roughly will be appeared in 2010-2015 year period of time.
梅特卡夫定律的关键在于曲线的拐点，在拐点上用户数目已经多到每增加一个新节点将产生不是几个而是几百万个新连接。
The key to Metcalfe's law is the knee in its curve, the point at which there are enough users so that each new node adds not a few but a few million new connections.
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