1、
使作为灰铸铁特征的片状石墨聚集成球，对冶金学家是一个挑战。
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2、
the metallurgist has made iron into dozens of different metals or alloy steels, as we call them.
冶金学家已用铁炼成了许多不同的金属，即我们所称呼的合金钢。
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4、
The metallurgist is a scientist who decides which material is most suitable for each purpose.
冶金学家是决定哪种金属最合适于某种用途的科学家.
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5、
I've come to pick your brains . You're metallurgist, and I've been asked this question about steel.
我是来讨教你的专门知识, 你是一位冶金专家,有人向我提出有关炼钢这个问题.
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