燙髮（名詞）
這個名詞是形容詞「持久」的具體產物——它其實是 permanent wave（持久的捲度）的簡稱，把「持久」直接拿來當那個東西的名字。
a perm (hair treatment) · noun · B1
A hair treatment that puts curls or waves into the hair to last for several months.
燙髮
核心畫面
Something that stays put through all the time ahead — it does not run out, wear off, or change back.
可以想成：一樣東西一路撐過往後的時間，不會用完、不會退掉、也不會變回原樣。permanent 的核心畫面比較像「一直…更多收起
可以想成：一樣東西一路撐過往後的時間，不會用完、不會退掉、也不會變回原樣。permanent 的核心畫面比較像「一直留著、穿過時間都還在」的那種持久。From the word’s history
From Latin permanere = per- (through) + manere (to stay, remain) — to stay through to the end. What is permanent stays through time instead of stopping partway.
來自拉丁文 permanere：per-（穿過）＋ manere（停留、留下），意思是「一路留到最後」。permanent 的東西就是能穿過時間繼續留著，而不是中途就停、就消失。
etymonline.com/word/permanent (Latin permanere = per- + manere)
From the picture
Also in this word
lasting, unchanging · adjective · B1
Lasting for a very long time or for all the time in the future; not going to change.
永久的／長期的
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。
permanentadj/ˈpɜː.mə.nənt/
- 1
Without end, eternal.
- Nothing in this world is truly permanent.
- Things that had been permanent and unquestionable were suddenly thrown into doubt.
- 2
Lasting for an indefinitely long time.
- The countries are now locked in a permanent state of conflict.
permanentnoun/ˈpɜː.mə.nənt/
- 1
A chemical hair treatment imparting or removing curliness, whose effects typically last for a period of weeks; a perm.
- She had pewter-coloured hair set in a ruthless permanent, a hard beak and large moist eyes with the sympathetic expression of wet stones.
- 2
combinatoricslinear-algebramathematicsGiven an n×n matrix a_ij,, the sum over all permutations π, of ∏ᵢ₌₁ⁿa_iπ(i).
- 3
A card whose effects persist beyond the turn on which it is played.
permanentverb/ˈpɜː.mə.nənt/
- 1
datedTo perm (the hair).
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。