---
id: vocab-49-00616
libId: 616
word: 一旦
type: vocabulary
dictionary:
  id: dict-49
  name: 科技汉语一二三级大纲词汇总
pinyin: yí dàn
difficulty: '2'
translations:
  english: once
  french: Une fois
  portuguese: uma vez
  spanish: Una vez
  russian: один раз
properties: 副
media:
  image: https://dl.baizor.com/public_resources/dictionary/dict-49/oss/images/level2/266.一旦.jpg
  audio: null
orderNum: 266
stats:
  sentenceCount: 2
  describeCount: 0
  characterCount: 2
completeness:
  hasBasicInfo: true
  hasTranslation: true
  hasAudio: false
  hasImage: true
  hasStrokeData: false
  hasExampleSentences: true
---

# --sentences--

## vs-1
**sentence**: 一旦下雨，我们的计划就要改变。

## vs-2
**sentence**: 一旦发生火灾，要立刻拨打火警电话。

# --media--

- **配图**: ![一旦](https://dl.baizor.com/public_resources/dictionary/dict-49/oss/images/level2/266.一旦.jpg)