第一，第二，第三，第四等等。我们称之为序数。

First, second, third, fourth and so on. We call them ordinals.

集合量词和基数词语、序数词语、概数词语都存在着选择限制关系。

There are some selection and restriction between measure classifiers and number words.

本文着重讨论了气煤葛金焦型与自由膨胀序数的相关关系。

This paper mainly deals with the correlativity between Gray-king Assay coke type(GAC) and free swelling index(FSI) on the gas coal.

在单点交叉过程中引入了逆序数向量进行交叉，简化了自然数序列的交叉过程。

During the single dot cross operation, import the athuard ordinal number arrow, simplify the cross operation of the natural sequence.

借助一阶逻辑演算有条件地把超限递归原理从序数类推广到具有良基关系的类上。

Let's conditionally generalize principle of transfinite recursion from ordinal number class to class with well-founded relation.