常見例句雙語例句In order to improve the properties of gray iron, the B containing pig iron is added to it instead of high priced ferroboron.在灰鐵生產(chǎn)中加入含硼生鐵，代替價格較高的硼鐵合金等，以達到提高性能的目的。權(quán)威例句It was replaced by a gray lull, all smoke and pig iron.NEWYORKER: Something Like Happy 返回 gray pig iron