wù / lǐ / kè / shàng / lǎo / shī / jiè / shào / le / pǔ / xī / zhè / ge / xī / là / zì / mǔ / de / xiě / fǎ / hé / dú / yīn

物理课上，老师介绍了普西这个希腊字母的写法和读音。

In physics class, the teacher introduced the form and pronunciation of the Greek letter psi.