Kè / táng / shàng / lǎo / shī / yòng / mó / xíng / yǎn / shì / le / quán / děng / tú / xíng / de / tè / diǎn

课堂上，老师用模型演示了全等图形的特点。

In class, the teacher used models to demonstrate the features of congruent figures.