zhè / bù / gǔ / jí / nèi / róng / suì / mì / xū / yào / fǎn / fù / yuè / dú / cái / néng / lǐ / jiě

这部古籍内容邃密，需要反复阅读才能理解。

The contents of this ancient book are profound and require repeated reading to understand.