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

• I advocated pi calculus channels because of their simplicity, which generally translates to performance and maintainability.
  我提倡使用pi演算通道是由于它的简单性，换句话说是由于它的高效性和可维护性。
• Research of Hybrid Excitation Claw Alternator Control System Based on Fuzzy Self-adaptive PI
  基于模糊自适应PI的混合励磁爪极发电机控制系统研究
• Predictive voltage feedback PI controller with feedforward voltage compensator is adopted as the controlled method of the inverter system.
  针对在光伏并网系统中采用单纯PI控制的缺点，提出了增加电网电压前馈控制来改善并网电流波形。
• 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。
• 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。
• 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。
• The test results show that it has better performance both in dynamic and steady state than traditional PI control.
  此方法计算量小，实验证明获得了较传统PI控制更好的动静态性能。
• We want to discuss sigma bonds and pi bonds.
  我们要讨论sigma键和π键。
• 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
• Research of fuzzy PI control of dual-motors driving servo system
  双电机驱动伺服系统的模糊PI控制研究