核心畫面
Picture a single tick of a counter: it happens one time. That bare idea — 'one occurrence' — is the seed of every use of 'once'. Counting from it, you can place that single time in the present (right now, at once), in the past (it happened once / it was once true but not now), or set it as a rule about how often (once a week). And because 'one time something happens' naturally marks a turning point, 'once' also becomes the hinge that joins two clauses: once X happens, Y follows. The many (once and for all, once in a blue moon, once bitten...) are all this same 'one time' frozen into set phrases.
可以想成計數器「答」的一下：發生了一次。這個最素的概念——「一次、一回」——是 once 所有用法的種子。從這顆種子…更多收起
可以想成計數器「答」的一下：發生了一次。這個最素的概念——「一次、一回」——是 once 所有用法的種子。從這顆種子數下去，你可以把這「一次」放在現在（此刻、立刻 at once）、放在過去（曾經發生過一次／曾經如此但現在不是了），也可以把它定成頻率規則（一週一次 once a week）。又因為「某事發生那一次」天生就是個轉折點，once 還變成串起兩個句子的關節：一旦 X 發生，Y 就跟著來。那一堆片語（once and for all、once in a blue moon、一朝被蛇咬…）也都是同一個「一次」被凝固進固定說法裡。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。
Oncenoun
- 1
slanglifestyleA fan of the Korean girl band Twice.
onceadv詞源 1/wʌn(t)s/
- 1
One and only one time.
- I have only once eaten pizza.
- 2
temporal-locationtimeFormerly; during some period in the past.
- He was once the most handsome man around.
- I once had a motorbicycle.
- 3
obsoleteAt any time; ever.
- If the facts once became known, we'd be in trouble.
- Once bring in the police and what is inevitably bound to follow? There will be calls and interrogations and cross-questionings […]
- 4
obsoleteOne day, someday.
- The wisdom of God thought fit to acquaint David with that court which we shall once govern.
- 5
mathematicssciencesMultiplied by one: indicating that a number is multiplied by one.
- Once three is three.
onceconj詞源 1/wʌn(t)s/
- 1
As soon as; when; after.
- Near-synonym: immediately
- We'll get a move on once we find the damn car keys!
這個拼法也被記錄為下列字的變化形：
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。