1. Fine cameoglass was produced by the Romans in the 1st century AD.
早在公元1世纪，罗马人已生产出精美的宝石玻璃品。
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2. The glass is then etched down to the inner layer leaving the design outline in relief. fine cameoglass was produced by the Romans in the1st century AD.
3. The glass is then etched down to the inner layer leaving the design outline in relief. fine cameoglass was produced by the Romans in the1st century AD.
