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

• An integral item of error was added to the PI regulative law to restrain interference effectively.
  在PI调节律中引入了对误差的积分项以更好地抑制外部扰动；
• 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。
• 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；
• However, PI and square root are a bit more common.
  然而，PI和平方根比较常见。
• In the process of rotor speed identification, the variable parameters PI mechanism, which has good dynamic and static performance and robustness are used.
  在转速辨识过程中，应用了具有较好动态性能和鲁棒性的变参数PI算法。
• 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。
• 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。
• 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。
• 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。
• 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。