pi
英 [paɪ]
美 [paɪ]
n. 圆周率; 希腊字母表的第16个字母
复数：pis
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
- 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。 - 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。 - 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。 - 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 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 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 - However, PI and square root are a bit more common.
然而，PI和平方根比较常见。 - 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 - 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 - 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；