核心畫面
Picture a line of things numbered off: the eighth is the one you reach when you have counted past seven. Cut a cake with that same number in mind and you get the other use — eight equal pieces, and one of them is an eighth.
可以想成：東西排成一列，數過七個之後碰到的那一個就是 the eighth。同一個「八」換個角度看，就是把一塊蛋糕切…更多收起
可以想成：東西排成一列，數過七個之後碰到的那一個就是 the eighth。同一個「八」換個角度看，就是把一塊蛋糕切成八等份——其中一塊叫 an eighth。英文的序數詞幾乎都身兼這兩份工作：排隊時是位置，切東西時是分母。原始詞典資料6 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。
eighthadj/eɪtθ/
- 1
The ordinal form of the number eight.
- Consequently, in the initial position the white pieces and pawns are placed on the first and second ranks; the black pieces and pawns on the eighth and seventh ranks.
- In 2023, the birthrate fell for the eighth consecutive year to 0.72, the lowest in the world, from 1.24 in 2015, raising concerns over the economic shock to society from such a rapid pace.
eighthnoun/eɪtθ/
- 1
The person or thing in the eighth position.
- 2
One of eight equal parts of a whole.
- Two bits equals two eighths of a dollar.
- Scientists from the University of Pennsylvania have determined that the young skull is only an eighth as strong as an adult one.
- 3
slangAn eighth of an ounce, or approximately 3.5 grams, of marijuana or other drugs.
- At midday he’d found an ageing eighth of hash in a drawer, a little bundle of cellophane.
- 4
An interval by doubling in pitch frequency.
eighthverb/eɪtθ/
- 1
To divide by eight.
- The first step is to eighth the script out. See figure 3.6 overleaf. Eighthing a script is subjective.
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。