The word 'once' is an adverb meaning 'one time' or 'formerly.'
单词 'once' 是一个副词，表示‘一次’或‘曾经’。
| 单词 | once |
|---|---|
| 发音 | [wʌns] |
| 释义 | adv. 一次；曾经 |
| 词序 | 301 |
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