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

第一，第二，第三，第四等等。我们称之为序数。

And, like arrays, collections use integer-ordinals to obtain particular items.

与数组一样，集合使用整序数获取特定项。

Creates a new column mapping, using column ordinals to refer to source and destination columns.

创建新的列映射，并使用列序号引用源列和目标列。

Other OpenType features include tabular and proportional figures, superior and inferior numerals, diagonal fractions, and ordinals.

其他OpenType 特性还包括，用于制表的等宽数字(tabular figures)和不等宽的比例数字(proportional figures)，上下标数字、分数以及序号等。