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在数学中，实闭域或实封闭域是一类有序域，使得其中每个正元素皆可表为平方，且任何奇数次多项式都有根。以下将给出几种等价的定义。
In mathematics, a real closed field is a field F that has the same first-order properties as the field of real numbers. Some examples are the field of real numbers, the field of real algebraic numbers, and the field of hyperreal numbers.
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