Medieval alchemists attempted to transmute base metals into gold.
中世纪的炼丹术士企图把贱金属炼成金。
Medieval alchemists attempted to transmute base metals into gold.
中世纪的炼丹术士企图把贱金属炼成金。
Both conditions can be detected by a temper etch (i.e., nital etch) inspection of the base metal.
两种情况在对本金属的回火蚀刻检查中会发现。
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