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

• 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。
• PI/ HO33342 double staining could distinguish apoptotic cells as well as normal cells;
  PI/HO33342双染可区别凋亡、坏死和正常细胞，且可以见到染色质碎裂；
• 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。
• 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
• 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。
• In our self-Oscillation drive system, the stable error of the oscillation amplitude is eliminated by the PI controller.
  在该闭环驱动系统中，通过引入PI控制器消除了振动幅度控制的稳态误差。
• 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。
• 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。
• However, PI and square root are a bit more common.
  然而，PI和平方根比较常见。
• 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。