zài / kuàng / wù / xué / kè / shàng / lǎo / shī / jiè / shào / le / děng / zhóu / jīng / xì / de / jī / běn / tè / zhēng

在矿物学课上，老师介绍了等轴晶系的基本特征。

In mineralogy class, the teacher introduced the basic features of the cubic crystal system.