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天然红宝石非常少见珍贵,但是人造并非太难,所以工业用红宝石都是人造的。
Ruby very rare precious natural, but not too difficult, so artificial industrial rubies are artificial.
youdao
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天然红宝石非常少见珍贵,但是人造并非太难,所以工业用红宝石都是人造的。
Ruby very rare precious natural, but not too difficult, so artificial industrial rubies are artificial.
youdao