This paper analyzes the measuring errors of the phasor measurement unit (PMU) and points out the necessity of state estimation based on PMU measurement.

分析了相量量测装置的量测误差情况，指出了相量量测参与状态估计计算的必要性。

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But if its necessity is demonstrated to us in the framework of everyday life, society, state, familiar emotion, then the horror is hallowed.

然而，如果在每日生活、社会城邦以及熟悉的情感框架中表现出了故事的必然，那么这种恐惧就值得我们顶礼膜拜了。

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It teaches in simple and easy to follow progressive steps how to attain this coveted state of inner peace, right here where you are, without the necessity of making any outer changes in your life.

它用简单易学、循序渐进的方法来教给你如何从此刻的状态达到你梦寐以求的精神状态，而无需做任何外部的变化。

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Scrooge, the boy, because a victim of that, believed that want was an ontological necessity, rather than a tragic by-product of state planning.

FORBES: Malthus and Scrooge: How Charles Dickens Put Holly Branch Through The Heart Of The Worst Economics Ever

In the age of Honest Obama, Israel is alone in recognizing the necessity of preventing Iran from acquiring the means to destroy the Jewish state.

CENTERFORSECURITYPOLICY: Honest Obama & Iran

What the state of Israel has done in Lebanon was necessity, as was the case in Gaza, the West Bank, even in the Sinai long ago.

BBC: You are in: Talking Point