In order to identify it, it is necessary to increase the number of observation equations.

为了进行识别，必需要增加观测方程的数目。

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For a variety of reasons, the number of observation stations has been decreasing after 1988.

由于种种原因，1988年以后观测资料正逐渐减少。

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The number of observation stations is considered on the basis of dendrogram analysis and economy .

运用聚类分析方法结合考虑经济性，选择合理的测点个数；

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Throughout the process, U.S. troops established a number of bases and observation posts throughout the city to prevent the insurgents from returning.

CENTERFORSECURITYPOLICY: Crass test Dems

During my 45-minute chat with him, which took place under the observation of a number of his minions, he explained why IPG not only remains relevant but is actually moving into exciting new areas.

FORBES: The Beating Heart of Hewlett-Packard Makes A Case For Relevance

In a paper just published in Physical Review Letters, Guenther Walther, a mathematician at Stanford University in California, shows that the observation that the number of neutrinos detected decreases when sunspots are plentiful is no more than an error in counting.

ECONOMIST: Particle physics