pig iron 的来源是什么

pig iron
The name is derived from the time when the iron ran into molds in sand beds fed from a common runner. The row of molds was said to resemble a litter of suckling pigs, hence the individual ingots were referred to as pigs and the runner was called the sow.

生铁. pig iron. 从高炉直接炼得并在模中铸出的粗铁,含炭量较高，含杂质较多，不适合直接使用，可以用来重新铸造成其它钢铁或合金。