Ordinal number
01
序数, 顺序数
a number that indicates the position of something in a sequence or series
例子
" First " is an example of an ordinal number.
"第一"是序数的一个例子。
The ordinal number " third " shows the runner's position in the race.
序数 "第三"显示了跑者在比赛中的位置。



























