Lǎo / shī / shuō / míng / rì / shì / yí / gè / biǎo / shì / rì / yè / de / gǔ / yǎ / shuō / fǎ

老师说，“暝日”是一个表示日夜的古雅说法。

The teacher said that “暝日” is an old-fashioned literary expression for day and night.