Spongy iron powder 又称海绵铁粉
This spongy iron could be hammered into shape to make tools and weapons.
这种海绵铁可以锻成一定形状，用来制造工具和武器。
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A hard problern is free from impurity iron in tbe preparation of cupric sulfate from spongy-copper.
用海绵铜生产硫酸铜，其困难在于除铁杂质。
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