The core of each sphere is a crystal of lithium iron phosphate. This acts as a standard battery material.
球体的核心是一组磷酸亚铁锂晶体，这相当于标准电池材料。
Silicon steel which is mainly used as iron core in transformers and electrical machinery is a kind of important function material.
硅钢主要用作变压器和电机的铁芯，是一种重要的功能材料。
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