| 字词 | 一旦 |
| 释义 | 一旦 名single day; very short time 毁于一旦be destroyed in one day 溃于一旦collapse overnight 连once; in case; now that 一旦时机成熟once the time is ripe 一旦制订了计划，你就应按计划行事。Once the plan is all set, you should keep to it. 机会一旦错过，永远不会再来。Once an opportunity slips away, it is gone for good. 一旦一夕 名one morning or evening; overnight; one day; very short time |
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