Following are a number of back-translations as well as a sample translation for translators of Isaiah 28:28:

• Kupsabiny: “Although wheat is threshed
  it is not threshed forever.
  Carts are driven over wheat to break (them/it)
  and it is not done so that they break into pieces.” (Source: Kupsabiny Back Translation)
• Newari: “For making bread, wheat flour must be crushed,
  one does not go threshing it.
  And large cartwheels may be rolled over it,
  no one uses horses to grind grain.” (Source: Newari Back Translation)
• Hiligaynon: “The grain which is being-made into bread can- easily -be-crushed, therefore he does -not -constantly thresh (it). He use cart with horses for threshing, but he makes sure that it will- not -be-crush.” (Source: Hiligaynon Back Translation)
• English: “And grain for baking bread is crushed easily,
  so the farmers do not continue to pound it for a long time.
  They sometimes cause their horses to pull a cart over it to thresh it,
  but doing that does not grind the grain.” (Source: Translation for Translators)