To sleep on straw and use a clod of earth as a pillow, an ancient ritual signifying profound mourning for one's parents and utmost filial piety.
在那个时代，子女为父母守孝，常常寝苫枕土，以示哀思和孝心。
In that era, children observing filial mourning for their parents often slept on straw and used a clod of earth as a pillow, to show their grief and filial devotion.
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