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单词 speculum metal
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WordReference Random House Unabridged Dictionary of American English © 2024
speculum met′al, 
  1. Metallurgyany of several bronze alloys with a high tin content, often containing other materials, as silver, brass, lead, zinc, or arsenic, used for making mirrors and reflectors. Also called speculum, speculum al′loy. 
  • 1790–1800

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更新时间:2024/11/10 15:10:49