It's a mathematical constant representing the ratio of any circle's circumference to its diameter.
pai是一个数学常量，代表圆周长跟直径的比值。
There is another issue too. Einstein introduced the speed of light as a mathematical constant, c.
还有一个另外的问题。
The golden ratio, also known as the divine proportion, is an irrational mathematical constant with a value of approximately 1.618033987.
黄金分割比率也称为神圣分割比例，它是一个数学无理常数，其值约为1.618033987。
In this paper, the governing process of gates is firstly analysed, and then the mathematical models of the operation of upstream constant level gate and that of downstream one are given.
本文首先分析了闸门的调节过程，然后给出了上游常水位闸门和下游常水位闸门工作的数学模型。
Thermal mass flow sensor has unique constant temperature principium as mathematical model for measuring medium mass flow without compensation of temperature and pressure.
采用独特的恒温原理建立数学模型，测量出介质的质量流量，无须温度和压力补偿。
The mathematical model and design method of hot wire sensors at constant voltage or constant temperature are expounded emphatically.
重点阐述了恒压和恒温工作方式下热线式传感器的数学模型和设计方法。
According to the soil dielectric constant and its microwave emissivity, the soil microwave brightness temperature is deduced, and its mathematical model is given.
根据土壤介电常数及相应的微波发射率，推算出亮度温度值，并给出了数学模式。
Any constant, built-in function, or mathematical expression can be used, except those that contain alias data types.
除了那些包含别名数据类型的表达式，可以使用任何常量、内置函数或数学表达式。
Finally this article analyzed the mathematical model of wind turbine, compared to the current different types of variable speed constant frequency wind power systems.
最后分析了风力机的数学模型，对比了目前采用的不同类型的变速恒频风力发电系统。
Several linear regression equations of the specific heat at constant volume for ideal gas based on MATLAB were proposed and proved by mathematical statistics, with maximum relative error less than 5%.
利用MATLAB的数值回归分析功能，得到了几种常见理想气体定容比热容与温度的线性回归公式，数理统计分析的结果证明了这些回归公式的合理性，回归公式的最大相对误差低于5%。
Several linear regression equations of the specific heat at constant volume for ideal gas based on MATLAB were proposed and proved by mathematical statistics, with maximum relative error less than 5%.
利用MATLAB的数值回归分析功能，得到了几种常见理想气体定容比热容与温度的线性回归公式，数理统计分析的结果证明了这些回归公式的合理性，回归公式的最大相对误差低于5%。
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