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/ˌθɜːrˈtiːn/ · /ˌθɜːˈtiːn/
The number 13, which comes after twelve and before fourteen. It is also used on its own to say how old someone is.
十三
核心畫面
You can picture thirteen as the count you reach one step past twelve: ten fingers plus three more. English builds it the way it builds fourteen to nineteen — 'three' plus '-teen' (a form of ten) — so the shape of the word itself says 'three on top of ten'. The same word does double duty for age: 'She's thirteen' needs no extra word for 'years old'.
可以想成一個「十再加三」的數量畫面：兩手十根手指數完，再多三根。英文 thirteen 到 nineteen 這一段…更多收起
可以想成一個「十再加三」的數量畫面：兩手十根手指數完，再多三根。英文 thirteen 到 nineteen 這一段的字都是「個位數 + -teen（十）」拼出來的，thirteen 就是 three 的變形加上 -teen，字形本身就在說「三疊在十上面」。它同時也直接拿來講年紀：說 She's thirteen，後面不用再加 years old，數字本身就是答案。原始詞典資料2 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。
thirteennum/ˌθɜːˈtiːn/
- 1
The cardinal number occurring after twelve and before fourteen: ten and three.
- There are thirteen cards of each of the four suits in a deck of playing cards.
- His brother's age is thirteen.
thirteennoun/ˌθɜːˈtiːn/
- 1
A group of thirteen items.
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。