steel简单

According to Sichel, although the falling price of nails was driven partly by cheaper iron and cheaper energy, most of the credit goes to nail manufacturers who simply found more efficient ways to turn steel into nails.

西切尔认为，尽管钉子价格下降部分源于铁和能源变得更便宜，但主要功劳应归于钉子制造商，他们找到了把钢铁制成钉子的更高效方法。