八的英文怎么写-英语里如何书写序数(Ordinal Numbers)

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Question问：

What is the rule when adding "th" or "st" or "nd" or "rd" when typing dates such as "July 4th"?

当输入日期如"July 4th" （“7月4日”）时，添加“th”或“st”或“nd”或“rd”的规则是什么?

Answer答：

When writing ordinal numbers such as 1st, 2nd, 3rd, etc. you should use the last two letters on the word as it would be if you wrote out the whole word. Below are the ordinal numbers both written out and with digits for 1-20.

当你写序数的时候，比如1、2、3等，你应该用单词的最后两个字母，就像你写整个单词一样。下面是1-20写出来的序数和带数字的序数。

first 1st（第一）second 2nd（第二）third 3rd（第三）fourth 4th（第四）fifth 5th（第五）sixth 6th（第六）seventh 7th（第七）eighth 8th（第八）ninth 9th（第九）tenth 10th（第十）eleventh 11th（第十一）twelfth 12th（第十二）thirteenth 13th（第十三）fourteenth 14th（第十四）fifteenth 15th（第十五）sixteenth 16th（第十六）seventeenth 17th（第十七）eighteenth 18th（第十八）nineteenth 19th（第十九）twentieth 20th（第二十）

As you can see, 1st, 2nd, and 3rd use -st, -nd, and -rd, but 4th-20th use -th. Follow this pattern for the numbers moving forward:

如你所见，第1次，第2次和第3次使用-st， -nd和-rd，但第4次到第20次使用-th。数字向前移动的模式如下:

21st, 31st, 41st, etc. all use -st like 1st.

22nd, 32nd, 42nd, etc. all use -nd like 2nd.

23rd, 33rd, 43rd, etc. all use -rd like 3rd.

All the rest use -th (24th, 37th, 49th, 50th, 68th, 126th…).

21、31、41等都使用-st，类似于1st。

22、32、42等都像2nd一样使用-nd。

23、33、43等都像3rd一样使用-rd。

其余的使用-th(24th, 37th, 49th, 50th, 68th, 126th…)