Cannon Foundry: Cannons are made here from pig iron and wood.

大炮制造厂：在这里把生铁和木头制成大炮。

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Pig iron and spiegeleisen in pigs, blocks or other primary forms.

生铁及镜铁，锭、块或其他初级形状。

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Since pig iron and scrap are cheap, and because there is no expensive refinement process, cast iron is a low cost material compared with steel.

由于生铁和废钢铁都便宜，又因为不需要昂贵的精炼过程，和钢相比铸铁是一种廉价材料。

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These do not quite fall into the category of entertainment, but they too depend more on human talent and ingenuity than on pig iron, steel mills or production lines and the Midwest has a good supply of them.

ECONOMIST: To natural assets add art, learning and fun

It was replaced by a gray lull, all smoke and pig iron.

NEWYORKER: Something Like Happy

Scientific housekeeping, with its standards of spotlessness and shininess, was founded on no less a fudge than the forty-seven and a half tons of pig iron.

NEWYORKER: Not So Fast