once
/wʌns/
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adv./conj. 一次；曾經；一旦
- We go to the movies once a month. 我們每個月看一次電影。
其他意思
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adv. 一次, 曾經, 一旦
If something happens once, it happens one time only.
- I met Wilma once, briefly
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conj. 一旦, 一經
If something happens once another thing has happened, it happens immediately afterwards.
- The decision had taken about 10 seconds once he'd read a market research study
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n. 一次
也出現在：
詞組搭配
- at once 立刻
- once upon a time 很久很久以前
- once in a while 偶爾
- for once 就這一次