其次，我们引入有序邻域语义，给出描述DEC2的特征公理的框架条件，证明DEC2相对这些框架条件是框架可靠的。

Secondly, we introduce the order neighborhood semantics, give the frame conditions of the character axioms of DEC2, prove the frame soundness of DEC2 with respect to the frame conditions.

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其次，我们引入有序邻域语义，给出描述DEC1的特征公理和规则的框架条件，证明DEC1相对这些框架条件是框架可靠的。

Secondly, we introduce the order neighborhood semantics, give the frame conditions of the character axioms and rules of DEC1, prove the frame soundness of DEC1 with respect to the frame conditions.

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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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