Yán / jiū / gǔ / jí / shí / chú / le / lǐ / jiě / nèi / róng / hái / xū / yào / yán / jǐn / de / kǎo / jù / gōng / fu

研究古籍时，除了理解内容，还需要严谨的考据功夫。

When studying ancient books, one needs rigorous textual research in addition to understanding their content.