It is important to analyze the tail behavior of distributions in many areas, and there is a controversy about distinctions between exponential-type and power-type tails.

分布的尾部特征分析在许多领域都非常重要，估计和分辨尾部服从幂律特征还是指数特征非常重要。

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On the basis of the method of action-angle variables the conditions of closed orbits under the action of general power-type gravitation potential are discussed on this paper.

本文采用作用角变量的方法，讨论了闭合轨道在一般幂次型引力势作用下的情况。

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One obvious way for firms in the power sector to reduce their emissions is to switch the type of energy they use, for example from inefficient coal-fired power stations to efficient gas stations.

BBC: Switching from high to low carbon energy is a challenge

The shock has propelled some moneyed buyers to consider a new, high-tech type of residence: the self-sufficient safe house that can withstand storms and power outages.

FORBES: Off-The-Grid Mansions

Included in the box: a power charger, USB 2.0 cable, a belt clip-type thing, replaceable battery, and headphones.

ENGADGET: Review of Motorola's 5GB M500 MP3 player