Logs base e (natural logarithms) appear in the calculation of compound interest, and numerous scientific and mathematical applications.

以 e为底的对数（自然对数）出现在复合计算以及大量科学和数学应用程序中。

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Analysis the character of hydrodynamic calculation for natural circulation of industrial boiler and give the recommendation of calculation method for simple and complex circulation circuit.

分析工业锅炉自然循环的水动力计算特点，对简单及复杂循环回路的计算方法提出建议。

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The dynamic transfer matrix can be used for calculation of exact natural frequencies and mode shapes for asymmetrical thin-walled beams and its assemblages.

动态传递矩阵可以用于计算非对称薄壁梁及其集合体的精确固有频率和模态形状。

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Natural gas emits half as much carbon dioxide as coal when used to make electricity, though the calculation fails to take into account the release of methane from natural-gas wells and pipelines, which also contributes to climate change.

WSJ: Rise in U.S. Gas Production Fuels Unexpected Plunge in Emissions