正是这种碳的球状微观结构，使得球墨铸铁具有更加良好的展延性和抗冲击性，而铸铁内部的薄片形式导致铸铁没有展延性。
It is this nodular microstructure of carbon in Ductile iron which produces high ductility and shock resistance while the flake form of cast iron results in no malleability.
铸铁内的碳天然形式是游离石墨薄片形式。
The natural form of carbon in cast iron is the free graphite flake form.
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