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obsidian

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n.黑曜石,十胜石
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obsidian为短语/超纲词汇

obsidian


n[U]

[Date: 1300-1400; Language: Latin;Origin: obsidianus lapis, mistake for obsianus lapis 'stone of Obsius', a Roman traveler said to have discovered the rock]
a type of rock that looks like black glass