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