yán / jiū / Táng / shī / gé / lǜ / shí / , / dà / yùn / shì / yí / gè / zhòng / yào / de / gài / niàn / 。研究唐诗格律时,大韵是一个重要的概念。When studying the metrical rules of Tang poetry, rhyme group is an important concept.