Scrap steel, grain, coal, concrete, and we can't move any of it now.

废钢、粮食、煤炭、水泥、我们都动不了。

Dad hand fed scrap steel into a device that chopped it as cleanly as a butcher chops a rack of ribs.

爸爸用手把废金属塞进一个装置，这个装置像屠夫剁肋骨那样，利索地切割金属。

The remainder comes from electric-arc furnaces, which use mainly scrap steel and can be run on renewable electricity.

其余部分来自电弧炉，电弧炉主要使用废钢，可以使用可再生电力运行。