gray pig iron
常见例句
- In order to improve the properties of gray iron, the B containing pig iron is added to it instead of high priced ferroboron.
在灰鉄生産中加入含硼生鉄，代替價格較高的硼鉄郃金等，以達到提高性能的目的。 - It was replaced by a gray lull, all smoke and pig iron.
NEWYORKER: Something Like Happy 返回 gray pig iron