lǎo / shī / yòng / shí / èr / dì / zhī / xiàng / wǒ / men / jiè / shào / le / gǔ / rén / jì / lù / nián / fèn / de / fāng / fǎ

老师用十二地支向我们介绍了古人记录年份的方法。

The teacher used the twelve Earthly Branches to explain how people in ancient times recorded years.