三十: thirty种: species钢材: steel products; steels; roll ...道琼斯三十种工业股票指数: dow jones industrial average index钢材: steel products; steels; rolled steel; rolled products特种钢: o special steels; t7-t12十种人生: life of ten超级特种钢: extra special steel合金钢，特种钢。: alloy steel特种钢板: special steel plate特种钢管: special steel tube特种钢丝: special wire特种钢丝绳: special wire rope一种钢丝网: hyrib薄钢材: light material短钢材: billet钢材秤: weighing machine for iron and steel materials钢材卷: coil reel stand型钢材: rolled sections; structural section圆钢材: round stock三十, 三十个: thirty三十，三十个: thirty这种钢笔且使呢: these fountain pens last a long time第三十: thirtieth三十八: thirty eight
