PI
/paɪ/📚 22785Pi is a number, approximately 3.14, which is equal to the distance around a circle divided by its width. It is usually represented by the Greek letter π. 圆周率
noun [专属名词]abbr. 产品改进（product improve）；预估发票，形式发票（proforma invoice）；首席研究员（principal investigator）
The key is the stylesheet processing instruction (PI) in the second line.
关键是第二行中的样式表处理指令（PI）。
单词造句:
- 网友用“PI”造句精选
- Zu was best known for his calculation of pi (π). 祖以计算 pi（Π）而闻名。
- In order to remember Zu, some mathematicians suggest calling pi "Zu Lv". 为了纪念祖，一些数学家建议称圆周率为“祖率”。