pi

英 [paɪ]

美 [paɪ]

n.  圆周率; 希腊字母表的第16个字母

复数：pis　

计算机

BNC.8364 / COCA.18727

牛津词典

noun

• 圆周率
  the symbol π used to show the ratio of the circumference of (= distance around) a circle to its diameter (= distance across), that is about 3.14159
• 希腊字母表的第16个字母
  the 16th letter of the Greek alphabet (Π, π)

柯林斯词典

• 圆周率（通常用希腊字母�表示，近似值为3.142）
  Piis a number, approximately 3.142, which is equal to the distance round a circle divided by its width. It is usually represented by the Greek letter �.

英英释义

noun

• the 16th letter of the Greek alphabet
• the ratio of the circumference to the diameter of a circle

双语例句

• Considering the characteristics of PMSM, a fuzzy-PI control method based on the fuzzy decision and relay self-tuning was proposed.
  针对永磁同步电机的特点，提出了基于模糊决策和继电自整定的模糊PI控制方法。
• The design of nonlinear PID and PI attitude-controller for a flexible spacecraft
  挠性航天器的非线性PID和PI姿态控制器设计
• PI controller is widely used in wind turbine control system and its parameters need to be identified.
  风电机组控制系统中PI控制器较多，需要辨识各PI控制器的参数。
• Then the PI tuning method of SISO was used to obtain the optimal PI controller for each loop.
  利用SISO系统PI控制器设计方法确定每个环路的最优PI控制器。
• We want to discuss sigma bonds and pi bonds.
  我们要讨论sigma键和π键。
• An integral item of error was added to the PI regulative law to restrain interference effectively.
  在PI调节律中引入了对误差的积分项以更好地抑制外部扰动；
• Net Search Extender supports comment nodes ( example 3 in Listing 30) and processing-instruction ( PI) modes.
  NetSearchExtender支持评论节点（清单30中的示例3）和处理指令（PI）节点。
• Simulation results show it is better than classic PI optimal controller.
  仿真结果表明，它也优于经典离散PI最优调节器。
• Application of PI Generalized Predictive Control with Time Stamp to Networked Control Systems
  时戳PI广义预测在网络控制系统中的应用
• This is a calculated pi source can be used as the primary portal learning.
  这是一个圆周率计算源码，可以作为初级入门学习之用。