yán / jiū / rén / yuán / zhèng / zài / zhěng / lǐ / yǒu / guān / wǔ / fú / zhì / dù / de / lì / shǐ / zī / liào

研究人员正在整理有关五服制度的历史资料。

Researchers are organizing historical materials about the five mourning grades.