蓝宝石 zhēnkōng
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zhēnkōng
noun
a vacuum
Domain: Modern Chinese 现代汉语 , Subdomain: Physics
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lánbǎoshí
noun
a sapphire
Domain: Modern Chinese 现代汉语 , Subdomain: Geology , Concept: Gemstone 宝石
Notes: (CC-CEDICT '藍寶石'; Guoyu '藍寶石')