Following are a number of back-translations as well as a sample translation for translators of Jeremiah 51:31:

• Kupsabiny: “Messengers come frequently to the king of Babylon bringing news that the whole city has been torn down from one end to the other.” (Source: Kupsabiny Back Translation)
• Hiligaynon: “The reporters will-follow-one-another to tell the king of Babilonia that his entire city was- now -captured.” (Source: Hiligaynon Back Translation)
• English: “Messengers will go quickly, one after another,
  to tell the king that his city has been captured.” (Source: Translation for Translators)