lǎo / shī / yòng / táo / yuán / sān / jié / yì / lái / shuō / míng / gǔ / rén / zhòng / shì / xiōng / dì / qíng / yì老师用桃园三结义来说明古人重视兄弟情义。The teacher used the Oath of the Peach Garden to explain how ancient people valued brotherhood.