名词
中文翻译：初级钢材
同义词：
['basic steel', 'mild steel']
例句：
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1.The primary steel is used in the construction of bridges and buildings.
初级钢材用于桥梁和建筑的建设。
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2. The steel plate is the primary material for making automobile bodies.
钢板是制造汽车车身的主要材料。
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3.The primary steel is heated to a high temperature before being rolled into sheets.
初级钢材在被轧成薄片之前需要加热到高温。