piKK [paɪ] /paɪ/发音名词1圆周率数学We used pi to calculate the area of the circle.我们用圆周率计算这个圆的面积。2希腊字母πThe symbol pi is the sixteenth letter of the Greek alphabet.符号π是希腊字母中的第十六个字母。用这个字练口说→