从字面上理解，取名“有理数”可能是说，这类数的存在是合理合法的。
Literally, it seems possible to say that the existence of rational number is reasonable.
因此说有理数集是一个有序的域。 序公理 。 因此说有理数集是一个有序的域 。
For this reason, we say that the set of rational numbers is an ordered field.
因此说有理数集是一个有序的域。 序公理 。 因此说有理数集是一个有序的域 。
For this reason, we say that the set of rational numbers is an ordered field.
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