单词：nodular iron
nodular iron的用法和样例：
例句
- Basic graphite morphology types of nodular iron were introduced.介绍球墨铸铁中石墨的基本形态类型。
- This iron is now typically known as Ductile Iron or S.G.Iron.这是铁的现在通常被称为球墨铸铁或球墨铸铁。
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