n.序数（如first,third等）( ordinal number的名词复数 )

序数词，[数]序数

ordinal number───[数]序数；序列号

cardinal numbers───[数]基数；基数词

cardinal number───基数

rational numbers───[数]有理数

decimal numbers───十进数

order numbers───订单号；订单编号

real numbers───实型数据；[数]实数（realnumber的复数）

serial numbers───序列号；序号；系列号

irrational numbers───[数]无理数

finite set, the ordinal and cardinal Numbers are equivalent, but they differ in the infinite case.───有限集，有序和基数是等价，但他们在不同情况下的无限。

Know the difference between ordinal numbers and cardinal numbers.───对比基数词和序数词的不同.

In this lesson, learners will read, write, and understand Ordinal Numbers and also understand questions and statements about the day and month of one's birthday.───在这堂课中，学员将学会读写并理解序数词，读写并理解关于生日月份和日期的问题和描述。

Know how to distinguish and use ordinal numbers and cardinal numbers.───掌握基数词和序数词的用法.

But what if arbitrarily divided regions of a rectangle are labeled with unique ordinal numbers?───但是,若将二维矩形平面任意分割成很多小的矩形区域,并以唯一的序号标记它们,情况会怎样 呢 ?

Remember to use ordinal numbers for dates in English.───记得在说日期时要使用序数词。

The hierarchy of logical systems that one obtains by the procedure that I have described above is characterized by computable ordinal numbers.

Know how to distinguish and use ordinal numbers and cardinal numbers.

Know the difference between ordinal numbers and cardinal numbers.

Ordinal numbers are used in these sentences: 'She was fifth in the race' and 'They celebrated the 200th anniversary of the university's foundation'.