zài / zhōng guó / gǔ dài / gāo zǔ / zhǐ / de / shì / zēng zǔ fù / de / fù qīn

在中国古代，高祖指的是曾祖父的父亲。

In ancient China, gaozu refers to one's great-great-grandfather (the father of a great-grandfather).