Hey guys! 我是英文庫的 Cecilia，中文裡要說「我是家裡的第二個小孩」，或是「他住在那裡的第二條街」，只要在阿拉伯數字前加上「第」就可以完整表達序數的概念，但英文完全是另外一套系統，尤其你可能很常聽到 first, second, …，不太曉得這些是什麼意思，也不知道後面又該如何接下去，對吧？
Hey guys! I'm Cecilia from the English library. Chinese says, "I'm the second kid in the house," or "He lives there on the second street," but English is a completely different system by adding the word "the first" to the Arabic numerals, especially since you may often hear what this means, and you don't know what to do with the rest, right?
別擔心！今天就讓我們來了解英文中序數的概念是什麼，以及序數要怎麼說吧！
Don't worry. Let's learn today what the concept of the English-language number is and what it is to say.
英文裡的數字，可以分為兩種，一種是「基數」（cardinal number），另一種是「序數」（ordinal number）。基數就是我們熟悉的 one, two, three …，而序數就是指「排順序」的數，例如第一、第二為 first, second … 等依此類推。
The numbers in English can be divided into two categories, one, two, three & #8230; and the number refers to the number , which is first, second, second & #8230; etc.
看完以下的序數對照表，你就會更清楚是怎麼一回事，如果想深入了解序數的規則和用法，記得再繼續往下看喔！
If you look at the following logarithms, you'll know better. If you want to know more about the rules and usage of the logarithmic numbers, keep looking down.
| 序數縮寫 | 序數 |
| 1st | first |
| 2nd | second |
| 3rd | third |
| 4th | fourth |
| 5th | fifth |
| 6th | sixth |
| 7th | seventh |
| 8th | eighth |
| 9th | ninth |
| 10th | tenth |
| 11th | eleventh |
| 12th | twelfth |
| 13th | thirteenth |
| 14th | fourteenth |
| 15th | fifteenth |
| 16th | sixteenth |
| 17th | seventeenth |
| 18th | eighteenth |
| 19th | nineteenth |
| 20th | twentieth |
| 21st | twenty-first |
| 22nd | twenty-second |
| 23rd | twenty-third |
| 24th | twenty-fourth |
| 25th | twenty-fifth |
| 26th | twenty-sixth |
| 27th | twenty-seventh |
| 28th | twenty-eighth |
| 29th | twenty-ninth |
| 30th | thirtieth |
| 31st | thirty-first |
| 32nd | thirty-second |
| 33rd | thirty-third |
| 34th | thirty-fourth |
| 35th | thirty-fifth |
| 36th | thirty-sixth |
| 37th | thirty-seventh |
| 38th | thirty-eighth |
| 39th | thirty-ninth |
| 40th | fortieth |
| 41st | forty-first |
| 42nd | forty-second |
| 43rd | forty-third |
| 44th | forty-fourth |
| 45th | forty-fifth |
| 46th | forty-sixth |
| 47th | forty-seventh |
| 48th | forty-eighth |
| 49th | forty-ninth |
| 50th | fiftieth |
| 51st | fifty-first |
| 52nd | fifty-second |
| 53rd | fifty-third |
| 54th | fifty-fourth |
| 55th | fifty-fifth |
| 56th | fifty-sixth |
| 57th | fifty-seventh |
| 58th | fifty-eighth |
| 59th | fifty-ninth |
| 60th | sixtieth |
| 61st | sixty-first |
| 62nd | sixty-second |
| 63rd | sixty-third |
| 64th | sixty-fourth |
| 65th | sixty-fifth |
| 66th | sixty-sixth |
| 67th | sixty-seventh |
| 68th | sixty-eighth |
| 69th | sixty-ninth |
| 70th | seventieth |
| 71st | seventy-first |
| 72nd | seventy-second |
| 73rd | seventy-third |
| 74th | seventy-fourth |
| 75th | seventy-fifth |
| 76th | seventy-sixth |
| 77th | seventy-seventh |
| 78th | seventy-eighth |
| 79th | seventy-ninth |
| 80th | eightieth |
| 81st | eighty-first |
| 82nd | eighty-second |
| 83rd | eighty-third |
| 84th | eighty-fourth |
| 85th | eighty-fifth |
| 86th | eighty-sixth |
| 87th | eighty-seventh |
| 88th | eighty-eighth |
| 89th | eighty-ninth |
| 90th | ninetieth |
| 91st | ninety-first |
| 92nd | ninety-second |
| 93rd | ninety-third |
| 94th | ninety-fourth |
| 95th | ninety-fifth |
| 96th | ninety-sixth |
| 97th | ninety-seventh |
| 98th | ninety-eighth |
| 99th | ninety-ninth |
| 100th | hundredth |
如果你想看 1 ~ 100 的數字對照表，可以參考下面的文章：
【英文數字】1-100 英文數字對照表
If you want to see a list of 1-100 numbers, you can refer to the following articles:
.
補充一下，超過一百以後的三位數或四位數等，其序數表達的邏輯就和你原本就會的數字（基數）一樣，看以下的例子，你就會更了解囉！
To add that after a hundred years, three or four digits and so on, the sequence indicates the same logic as the number you would have known. Look at the following example, you'll understand better!
- 101st=one?hundred (and) first
- 311th=three hundred (and) eleventh
- 1000th=thousandth
- 5289th=five thousand, two hundred (and) eighty-ninth
（*以上的?and 通常會省略）
(* Above? and usually omitted)
序數可以分成規則和不規則兩種，但還好絕大部分都屬規則的字，所以不用太緊張。
The number can be divided into rules and irregularities, but it is good that most of them are in the language of the rules, so there is no need to be too nervous.
最不規則的序數，其實一開始就已經出現了，分別是：
The most irregular number, which has been in existence since the beginning, is as follows:
- first（第一）
- second（第二）
- third（第三）
英文的序數還有縮寫的寫法，只要在阿拉伯數字後面加上序數的最後兩個字即可。 例如：first=1st , second=2nd, third=3rd。
The English number of
再來是規則的序數，好消息是從從第四開始，一直到第十九，基本上就是在基數字尾加上 th，例如：fourth / 4th、sixth / 6th 等等。
And then the rule number, and the good news is from the fourth to the nineteenth, basically by adding twirly at the end of the base number, for example: fourth/4th, sixth/6th and so on.
不過，還是有一些值得注意的變化，這時候就得慢慢練習，將它們記在腦海裡面啦！
But there's still some notable changes, and it's time to practice and remember them in your head!
- 直接加 th。
例：seventh / 7th、tenth / 10th、eleventh / 11th - 字尾 t，直接加上 h。
例：eighth / 8th - 字尾 ve，要去 ve 再加上 f，再加上 th。
例：fifth / 5th、twelfth / 12th - 字尾 ty，要去 y 再加上 ieth。
例：twentieth / 20th、thirtieth / 30th
到了 20 以後，包含 30、40、50… 依此類推，一直到 99，都是用基數加上連字號 (-)，再加上 1 ~ 9 的序數。例如：第 21 會是 twenty-first / 21st、第 22 是 twenty-second / 22nd、…、第 29 是 twenty-ninth / 29th。
After 20, it contains 30, 40, 50 & #8230; by this type, until 99, all are hyphenated (-) with base numbers plus 1 ~ 9. For example: 21 will be twenty-first/21st, 22 twenty-second/22nd, #8230; 29 is twenty-ninth/29th.
動動腦的時間到了，我們再練習一次，不要偷看上面的對照表，想想以下幾個數字的序數會是什麼呢？
Now that it's time to be brain-motivated, let's practice again. Don't peek at the table. What's the sequence of the following numbers?
- 第 33=?
- 第 49=?
- 第 88=?
公佈答案：
The answer is published:
- 第 33=30 + 3 的序數=thirty-third / 33rd
- 第 49=40 + 9 的序數=forty-ninth / 49th
- 第 88=80 + 8 的序數=eighty-eighth / 88th
你答對了嗎？沒答對的話也沒關係，再接再厲喔！
Are you right? If you don't, it doesn't matter.
third wheel 不是第三個輪子，是約會裡「電燈泡」的意思啦！
我們來看看有哪些時機會用到序數，記得在使用序數的時候，一般要加上定冠詞 the，或是所有格。
Let's see when there's a chance to use the number, remember, when you use the number, you usually have to add the word " the ", or all the cells ".
I live in the second house on the right.
我住在右側的第二間房子裡。I live in the second house on the right.
I live in the second house on the right.I’m always the first person to arrive at the office.
我總是第一個到辦公室的人。I & #8217; m always the first person to come at the office.
I'm always the first person to come to the office.It’s my third job this year.
這是我今年的第三個工作。It & #8217;s my
third job this year.
This is my third job this year.
英文裡常會碰到贏得獎項的情況，像是某某人獲得第二名，還是贏得第一名獎牌等等，注意這個用法比較特別，不能在序數前面加定冠詞 the 喔！
In English, there's always a winner, like someone who wins the second prize or the first medal, and so on.
She won first prize in the contest.
她在這個競賽中獲得第一名。She won first prize in the contest.
I was born on September 2nd.
我在九月二日出生。I was born on September 2nd .
I was born on September 2nd.
關於日期的唸法和寫法，都需要多留心，例如：
Much attention needs to be paid to the reading and writing of dates, for example:
英式和歐洲的日期寫法是先寫日期才寫月份，因此 2020 年 10 月 10 日會寫成 10th October, 2020，但唸法會是?the tenth of October, twenty-twenty。
The English and European dates are written on a date before month, so 10th October, 2020, but the Law Society is? the tenth of October, twenty-twenty.
而美式的日期寫法則是先寫月份才寫日期，因此 2020 年 10 月 10 日會寫成 October 10th, 2020，唸成 October the tenth, twenty-twenty。
The American way of writing dates is the month before the month, so October 2020, October 10th, 2020, as October the tenth, twenty-twenty.
在寫法上，無論是哪一種，代表日期的序數詞詞尾 (-st, -nd, -rd 或 -th ) 都可以省略。
In writing, either way, the end of the word (-st,-nd,-rd or-th) representing the date can be omitted.
I spent my 18th birthday at a hotel this year.
我今年在飯店度過我的十八歲生日。I spent my 18th day at a hotel this year.
She lives on the 3rd floor.
她住在三樓。She lives on the
3rd floor.
she lives on the third floor.
這裡的分數不是指獲得幾分的分數，而是指幾分之幾的分數，此時分子需用基數，分母需用序數表示，且分子若大於一，分母需加上 s。
The fraction here refers not to a fraction of a fraction, but to a fraction of a fraction of a fraction, at which point the molecule must use a base number, the denominator must be expressed by a serial number, and if the molecule is greater than one, the denominator must add s.
One-third of the students in this class were tested positive for COVID-19.
這個班級全班三分之一的學生被檢測出新冠肺炎陽性。One-third of the students in this class were tested positive for covid 19.
Columbus was so hungry that he ate two-thirds of the pizza.
哥倫布餓到吃了三分之二個披薩。Columbas was so hungry that he ate two-thirds of the pizza.
Columbus was hungry to eat two thirds of the pizza.
英文中的序數本身有不少規則可循，其實沒有想像中困難，只是仍有一些細節需要多加留意，相信多加練習，你一定可以練就一身好功夫！
There are rules in the English sequence itself, but it's not hard to imagine, but there are details that need more attention, and I'm sure you can practice more.
下次有英文疑問時，也不要忘了回來英文庫坐坐啦！
Don't forget to come back to the library next time you have an English question!
想看更多和序數和數字有關用法，可以參考以下文章：
日期/月份/星期/時間 正確英文格式、寫法！一次搞懂！
【英文數字】1-100 英文數字對照表
【次數/倍數英文】once, twice, 然後呢？
For more and more serial and numerical applications, the following articles can be consulted:
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