Following are a number of back-translations as well as a sample translation for translators of Isaiah 21:7:

• Kupsabiny: “When he sees a young man who come with horses
  going two by two,
  or who comes on/with donkeys and camels,
  look around and examine carefully.’” (Source: Kupsabiny Back Translation)
• Newari: “Whenever he sees chariots with a team of horses,
  and riders on donkeys or riders on camels coming,
  at that time he must be attention” (Source: Newari Back Translation)
• Hiligaynon: “He should watch carefully and if he sees a chariot and horse-riders in pairs, and soldiers riding on donkeys and camels, he should-tell (it) immediately.’” (Source: Hiligaynon Back Translation)
• English: “Tell him to watch for chariots pulled by pairs of horses,
  and men riding camels and donkeys, coming from Babylon.
  Tell the watchman to watch and listen carefully!’” (Source: Translation for Translators)