另一种说法是，这种颜色可能与冰中含有的大量金属化合物有关，包括铜和铁。
Another suggestion is that the color might be related to ice with high levels of metallic compounds, including copper and iron.
干扰的因素包括铜，铁缺乏和铅中毒。
Causes include copper or iron deficiency and lead poisoning.
我们的高品质灰铁包括铜，以提高热导率和磨损性能。
Our high quality grey iron includes copper to increase thermal conductivity and wear properties.
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