Refers to profound and subtle principles or truths that are not immediately obvious but are deeply integrated and encompass everything, often requiring deep contemplation to understand.
这部古老的哲学著作，其核心思想退藏于密，需要读者反复揣摩才能领会其精髓。
The core ideas of this ancient philosophical work are profound and subtle, requiring readers to ponder repeatedly to grasp their essence.
Era:
Ancient
Frequency:
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