| 词汇 | 一旦 |
| 释义 | 一旦 yīdàn A. noun very short time ▸ 毁于一旦 be destroyed in one day ▸ 溃于一旦 collapse overnight B. adverb once ▸ 一旦时机成熟 once the time is ripe ▸ 机会一旦错过，永远不会再来。 Once an opportunity slips away, it is gone for good. |
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