Aggregated economy theory is the classical principle of urban and region economy theory while aggregated economy effect is the basic effect during the process of urbanization.

聚集经济原理是城市和区域经济理论中的经典思想，聚集经济效应是城市化过程中的基础效应。

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In the survey of forest management previously, the statistic relationship between the photo interpretation volume of the plot and the practical measurement is based on the classical principle of MLS.

以往森林经理调查中，航片判读小班蓄积与地面实测蓄积之间的统计关系多建立在经典的最小二乘原理之基础上。

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A new analytical method of pin load computation for joints with multi-rivets or multi-bolts is presented by means of mathematical theory of elasticity and classical principle of structural mechanics.

对多钉连接件钉传载荷的计算问题提出了一个解析分析方法，推导了求解钉载的线性代数方程组并给出了若干算例。

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Just as Kandinsky turned his back on figuration, so did the atonal composers of the early 20th century, led by Arnold Schoenberg, abandon tonal harmony, the fundamental ordering principle on which all Western classical music had previously been based.

WSJ: The Seductive Lure of Abstraction | Sightings by Terry Teachout

The lack of any monetary rule to constrain the Fed and the lack of any convertibility principle, as existed under the classical gold standard, means the Fed has a monopoly on base money (currency held by the public plus reserves), the supply of which is determined by a small group of Fed officials who presume to be able to forecast the future.

FORBES: The Federal Reserve's Flawed Approach To Monetary Policy