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钙 一种具有延展性的银白色碱金属元素，在地壳中含量排第五，通常以碳酸钙的形式存在。它是骨骼和牙齿的基本成分，并且用来作钢铁的还原剂。 gài
environ.	cailciam

钙: 1 phrase in 1 subject

Environment

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