回溯

huí sù dào wǒ men xiān bèi kāi chuàng xiàn fǎ de shí hou

回溯到我们先辈开创宪法的时候。

Back in the days of the elder generations invented the constitution.

tā de jiā shì kě yǐ huí sù hěn duō shì jì yǐ qián

他的家世可以回溯很多世纪以前。

His family can trace back many centuries.