Zài / jǐ / hé / kè / shàng / lǎo / shī / yòng / mó / xíng / zhǎn / shì / le / duì / ǒu / duō / miàn / tǐ / de / jié / gòu

在几何课上，老师用模型展示了对偶多面体的结构。

In geometry class, the teacher used a model to demonstrate the structure of a dual polyhedron.