In the supply chain of professional machine translation software development, which critical linguistic resource typically requires the largest investment of human labor hours?

Modern language products like translation software, dictionaries, and language learning apps don't appear from thin air! Behind every successful language technology is a complex supply chain involving linguists, data scientists, voice actors, and cultural consultants. Test your knowledge about how language products are developed and brought to market in this challenging trivia question.

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Parallel corpus development (aligned bilingual texts for training)
Speech synthesis voice recording
UI/UX localization for different markets
Terminology dictionary compilation