pis

n.

圆周率(π)( pi的名词复数 )；

pi controller比例积分控制器

1. Zu Chongzhi accurately calculated the value of pi to seven decimal places.
   祖冲之很早就把圆周率准确推算到小数点后七位。
2. Ignoring a clunky numerical system and devising his own, he demonstrated the nature of infinity and calculated a value for pi.
   他否决了当时繁冗的数字表达方式，发明出自己的数字系统，证明了自然的无穷性，并计算出圆周率的值。

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