shēng / wù / kè / shàng / lǎo / shī / jiè / shào / le / zhēn / hòu / shēng / dòng / wù / de / jī / běn / tè / zhēng

生物课上，老师介绍了真后生动物的基本特征。

In biology class, the teacher introduced the basic characteristics of eumetazoans.