abbr. 图片兴趣探测调查（Picture Interest Exploration Survey）

n dish baked in pastry-lined pan often with a pastry top
n a prehistoric unrecorded language that was the ancestor of all Indo-European languages

PI的用法和样例：

例句

用作名词(n.)

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。
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。

词汇搭配

pi point[电] π点
symmetrical pi attenuator对称π型衰减器...
pi sectionπ形节(II形节)...
pi networkπ电网络
pi connectionπ连接
pi section filterπ节滤波器
pi mode[电] π模态
pi type filterπ型滤波器
pi planeπ平面
pi mesonπ介子
pi jaw训诫,训话

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protease inhibitor蛋白酶抑制剂...
Sherlock私家侦探[亦可小写]...
operative有效的
private detective私人侦探
private eye<俚>私家侦探...

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