To make a sapphire crystal, the basic material used is a salt cleansed from any foreign body (ammoniacal alum).

蓝宝石水晶玻璃的主要原料是一种经过洗涤后除去了所有异物的盐(氨明矾)。

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To make a sapphire crystal, the basic material used is a salt cleansed from any foreign body (ammoniacal alum).

蓝宝石水晶玻璃的主要原料是一种经过洗涤后除去了所有异物的盐(氨明矾)。

youdao