10 sentences for 一旦 (yī​dàn — once)

1. 一旦开始，就不能停下来。

   yī​dàn kāi​shǐ, jiù bù​néng tíng xià​lai.

   Once you start, you can't stop.

   Source: Dong Chinese Dictionary

2. 一旦遇到紧急情况怎么办？

   yī​dàn yù​dào jǐn​jí qíng​kuàng zěn​me​bàn?

   What if there's an emergency?

   Source: OpenSubtitles

3. 一旦开始了就很难停下来啊。

   yī​dàn kāi​shǐ le jiù hěn nán tíng xià​lai a.

   Once you get going, it's really hard to stop.

   Source: OpenSubtitles

4. 一旦堕入邪路，就很难再回头了。

   yī​dàn duò rù xié​lù, jiù hěn nán zài huí​tóu le.

   Once you fall into evil ways, it is hard to turn back.

   Source: Dong Chinese Dictionary

5. 一旦发现漏水，系统会自动报警。

   yī​dàn fā​xiàn lòu​shuǐ, xì​tǒng huì zì​dòng bào​jǐng.

   The system will automatically sound an alarm if a leak is detected.

   Source: Dong Chinese Dictionary

6. 他早已交代好，一旦无常，丧事从简。

   tā zǎo yǐ jiāo​dài hǎo, yī​dàn wú​cháng, sāng​shì cóng​jiǎn.

   He had already instructed that in the event of his passing, the funeral should be simple.

   Source: Dong Chinese Dictionary

7. 一旦陷入这种麻烦的纠纷，想抽身可就难了。

   yī​dàn xiàn​rù zhè zhǒng má​fan de jiū​fēn, xiǎng chōu​shēn kě jiù nán le.

   Once caught in such a troublesome dispute, it's hard to get away.

   Source: Dong Chinese Dictionary

8. 一旦京城有变，你一定要立刻护送王妃离开。

   yī​dàn jīng​chéng yǒu biàn, nǐ yī​dìng yào lì​kè hù​sòng wáng​fēi lí​kāi.

   If anything happens in the capital, you must escort the princess out immediately.

   Source: Dong Chinese Dictionary

9. 他这人性格太倔，一旦决定的事情谁也劝不动。

   tā zhè rén xìng​gé tài jué, yī​dàn jué​dìng de shì​qing shéi yě quàn bù dòng.

   He is so stubborn that once he makes up his mind, no one can talk him out of it.

   Source: Dong Chinese Dictionary

10. 古代的国人一旦联合起来，甚至可以废黜不称职的君主。

    gǔ​dài de guó​rén yī​dàn lián​hé qi​lai, shèn​zhì kě​yǐ fèi​chù bù chèn​zhí de jūn​zhǔ.

    In ancient times, once the citizens united, they could even depose an incompetent monarch.

    Source: Dong Chinese Dictionary