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一旦

HSK 5

yídàn

once; as soon as

Alternative translations

  • aussitôt que
  • si jamais
  • en un jour

Explanation

if; once (sth happens, then...); when; in a short time; in one day

Examples

一旦下雨，我们就回家。

yīdàn xiàyǔ, wǒmen jiù huíjiā.

As soon as it rains, we go home.

一旦他来了，你告诉我一声。

yīdàn tā lái le, nǐ gàosu wǒ yìshēng.

Tell me when he arrives.