1 sentence

1. 听到这个好消息，他的忧虑立刻烟消云散了。

   tīng​dào zhè​gè hǎo xiāo​xi, tā de yōu​lǜ lì​kè yān​xiāo​yún​sàn le.

   Upon hearing the good news, his worries vanished into thin air.

   Source: Dong Chinese Dictionary