If something has been abandoned, you can call it derelict. Even if a person has abandoned his responsibilities, you can say that he is derelict in his duties. But don't call a lost child derelict — unless, of course, he has neglected his chores.
relic
This stone axe is a relic of ancient times. 这石斧是古代的遗物。
a museum of war relics.战争遗迹纪念馆 记忆技巧：muse 沉思 + um 场所 → 博物馆
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