通过在其他制作玻璃的原料中添加金属化合物，你可以得到特定的颜色。
You got specific colors by adding metallic compounds to the other glass making ingredients.
真正棘手的原料是稀土金属，比如用在涡轮机变速箱中的钕。
The most problematic materials may be rare-earth metals such as neodymium used in turbine gearboxes.
目前看多是用诸如锌、铜等金属的氧化物，但碳原料的微小管件也被开发出来。
At the moment oxides of metals such as zinc and copper seem to be the favourites, but tiny tubes made of carbon are also being explored.
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