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CO2 is part of the structure of copper oxide material which should be effective.
CO2是这个结构的一部分和加有氧化铜的材料会很有效。
youdao
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If you cool it too quickly, the black oxide will stay stuck to the copper.
如果你冷却太快，黑色氧化物将继续坚持铜。
youdao
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If you cool it too quickly, the black oxide will stay stuck to the copper.
如果你冷却太快，黑色氧化物将继续坚持铜。
youdao