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once是什麼意思_once的翻譯_音標_讀音_用法_例句_愛詞霸在線詞典

(與後接day, week, month等的a連用)(每…)一次,(每…)一回 You use once with 'a' and words like 'day', 'week', and 'month' to indicate that something happens regularly, one time in each day, week, or month....

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