lì shǐ kè / shàng / lǎo shī / jiě shì / shuō / gǔ jí / zhōng / de / dì jīng / tōng cháng / jiù / shì / zhǐ / huáng dì / suǒ zài / de / jīng chéng

历史课上，老师解释说，古籍中的帝京通常就是指皇帝所在的京城。

In history class, the teacher explained that in ancient texts, 帝京 usually referred to the capital where the emperor resided.