Meaning of pí:
皮
surname Pi; leather; skin; fur; CL:張|张[zhang1]
Tā de xìng shì Pí.
他的姓是皮。
His surname is Pi.
Zhège dàizi shì yòng pí zhìchéng de.
这个袋子是用皮制成的。
This bag is made of leather.
Tā de pí hěn guānghuá.
她的皮很光滑。
Her skin is very smooth.
Zhè zhī húli de pí máo hěn róuruǎn.
这只狐狸的皮毛很柔软。
The fur of this fox is very soft.
Zhè zhī qiú de pí fēicháng jiéshí.
这只球的皮非常结实。
The skin of this ball is very durable.
pico- (one trillionth)
Yī gè pí miǎo dàyuē shì yī wàn yì fēn zhī yī miǎo.
一个皮秒大约是一万亿分之一秒。
A picosecond is approximately one trillionth of a second.
naughty
Zhège xiǎohái zhēn pí, fānle zhěnggè fángjiān.
这个小孩真皮,翻了整个房间。
This child is really naughty, he turned the whole room upside down.