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。
• 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
• 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。
• 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
• 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。
• 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。
• 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。
• We want to discuss sigma bonds and pi bonds.
  我们要讨论sigma键和π键。
• The controller consisted of a PI feedback controller and a self-adaptive DRNN feed-forward controller.
  反馈控制器以目标转速与实际转速的误差为输入量，采用PI控制来提高控制系统的稳定性。
• The output voltage of converter is stabilized at the reference value by PI close-loop control.
  通过PI闭环控制，将变流器输出电压实时稳定于基准值。