Which groundbreaking linguistic product design feature did Google introduce in 2006 that revolutionized online translation?

Product design in the language industry has evolved dramatically over the decades. From early translation dictionaries to modern AI-powered language tools, linguistic considerations have shaped how we interact with language products. This poll tests your knowledge about a pivotal language product design innovation that transformed how we communicate across language barriers.

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Statistical machine translation that learned from existing human translations rather than following programmed rules
The first commercially available neural machine translation system
Real-time voice translation with accent preservation
Contextual dictionary that adjusted definitions based on surrounding text