A metaphor for the deep sorrow and longing felt when one's parents have passed away, regretting the inability to have shown them proper filial piety and care.
每当看到别人与父母团聚，他都会生出风木之思，感叹子欲养而亲不待。
Whenever he saw others reunite with their parents, he would feel the deep sorrow of having lost his own, lamenting the missed opportunity to care for them.
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