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

• 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。
• 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。
• In the corporate brand building, Product Identity ( PI) strategy is very important.
  在企业的品牌建设中，产品形象识别（PI）策略是非常重要的。
• 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
• 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。
• Fuzzy PI Control Strategies of Networked Control System
  网络控制系统的模糊PI控制方法
• Opinions in the literature, Cao Pi and Cao Zhi on the surface seems to be different.
  在文学的意见上，曹丕和曹植表面上似乎是不同的。
• The inner loop adopts PI algorithm and the outer loop adopts a time optimal self-tuning PID algorithm.
  伺服控制器分别采用有源PI校正和时间最小参数自调整PID控制算法。
• 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。
• 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