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

• 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。
• 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 model of speed loop control system as well as the integral separating PI controlled algorithm was analyzed in detail.
  对控制系统建模和积分分离PI算法进行了详细的分析。
• However, PI and square root are a bit more common.
  然而，PI和平方根比较常见。
• 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。
• 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
• 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。
• I am thrilled by seeking a story in pi.
  在其中寻找一个故事才是令我兴奋的事情。
• 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。
• Fuzzy PI Control Strategies of Networked Control System
  网络控制系统的模糊PI控制方法