When we pay homage to the ancient battlefield, the fire and smoke have dissipated, leaving only broken walls and ruins. The battles of gold and iron, horses and flesh and blood have been buried by the sand of time. At this time, even those who have personally experienced the battle will no longer be as helpless and desperate as before, no matter how many emotions they have. This metaphor very truly expresses the mood of all "experienced people" looking back on "past events" - desolate and calm, depressed and detached.

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