Zài / gǔ / dài / wén / xiàn / zhōng / zhòu / zǐ / cháng / zhǐ / dì / wáng / huò / guì / zú / de / zhǎng / zǐ

在古代文献中，胄子常指帝王或贵族的长子。

In ancient texts, 胄子 often refers to the eldest son of an emperor or noble.