第四這個位置
三個用法都是同一個「排第四」的位置，只是換了詞性：先當標籤，再當代名詞，最後因為切成四份而變成份量。
fourth (ordinal) · adjective · A2
Coming after the first three things in an order or series.
第四的
核心畫面
You can think of a line of things in order — first, second, third, and then the one right after the third: that position is 'fourth'. Once you can point to that slot, you can use the word three ways: as a label for the thing in that slot (the fourth runner), as the thing itself without naming it (you came fourth), and — because cutting something into four equal slots gives pieces of that size — as one of those four parts (a fourth of the cake).
可以想成把東西排成一列——第一、第二、第三，接著緊跟在第三後面的那一個，那個位置就是「第四」。一旦能指出這個位置，這…更多收起
可以想成把東西排成一列——第一、第二、第三，接著緊跟在第三後面的那一個，那個位置就是「第四」。一旦能指出這個位置，這個字就能有三種用法：當形容詞替那個位置上的東西貼標籤（the fourth runner），當代名詞直接指那個東西本身而不點名（you came fourth），以及——因為把一個東西切成四等份，每份就是那個大小——指那四份裡的一份（a fourth of the cake）。One branch
原始詞典資料8 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
Fourthname/fɔɹθ/
- 1
The Fourth of July.
fourthadj/fɔːθ/
- 1
The ordinal form of the number four.
- The fourth model is called the enlightment model: Actors are seen to be responsible for problems but unable or unwilling to provide solutions. They are believed to need discipline provided by authoritative guidance. The Alcoholic Anonymous^([sic]) groups are considered prototypical for this model.
- Finnley is the fourth daughter of Jason and Kylie Kelce, having already welcomed Wyatt, Elliotte and Bennett to the family.
fourthnoun/fɔːθ/
- 1
The person or thing in the fourth position.
- We are one F and two M's seeking the company of a fourth (M or F) for our spacious and friendly Somerville apt.
- 2
A quarter, one of four equal parts of a whole.
- 3
The fourth gear of an engine.
- 4
entertainmentlifestylemusicA musical interval which spans four degrees of the diatonic scale, for example C to F (C D E F).
- Now I've heard there was a secret chord / That David played, and it pleased the Lord / But you don't really care for music, do ya? / It goes like this, the fourth, the fifth
- 5
rareastronomynatural-sciencesOne sixtieth of a third or tierce.
- […] thirds (sixtieths of seconds), fourths (sixtieths of thirds) and so on, but then it becomes very cumbersome.
fourthverb/fɔːθ/
- 1
informalTo agree with a proposition or statement after it has already been thirded.
- If he remembered rightly what took place in the House on the first night of the session, the Attorney General would have to file an information, not only against the noble Lord who proposed the address, and the hon. Member for London who seconded it, but also against the hon. Member who thirded, and the noble Lord who fourthed it, and indeed against every Member in the House.
- A lisping young “Soundings,” or master’s assistant, sung out “I thecond the mothon,” instantly transferring his beer to our hero’s face. In short the resolution was thirded, fourthed, fifthed, and sixthed, all following suit with the swipes:[…]
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。