Which AI translation tool pioneered the use of 'Zero-Shot Translation' in 2016, allowing it to translate between language pairs it had never explicitly been trained on?

The field of language translation has been transformed by artificial intelligence in recent years. Major tech companies have developed sophisticated neural machine translation (NMT) systems that have dramatically improved the quality and accuracy of automated translation. These systems have revolutionized cross-cultural communication and enabled new possibilities for global content localization. Test your knowledge about one of the most significant developments in this space!

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Google Translate (using Google's Neural Machine Translation system)
DeepL Translator
Microsoft Translator (powered by Z-Code)
Meta's No Language Left Behind (NLLB)