their case they used English to French so they trained a machine translation model between those two languages then they translate the English sentence into French they then take that French translation from the model and they translate that back into English and and then they use that as the Augmented sample in the model so obviously any machine translation model is going to have some some loss and it's not going to exactly translate something the same way back and forth so in this case you can see a lot of it has stayed the same