Yán / jiū / rén / yuán / bǎ / gǔ / dài / de / shì / lí / huàn / suàn / chéng / háo / mǐ / fāng / biàn / dú / zhě / lǐ / jiě

研究人员把古代的市厘换算成毫米，方便读者理解。

Researchers converted the ancient li into millimeters to make it easier for readers to understand.