Google’s populate translator app will soon be landing on your smartwatch for you to use. Over 500 million people use Google Translate each month across all platforms (Desktop, smartphone, and tablet).
Once the Android Wear update arrives you can run the translate feature on your smartwatch without needing the standalone app on your smartphone. To start translating, first speak into your watch what you want to say. Flip your wrist to show the translation to your friend. After your friend responds in their native language, flip your wrist back and you will see their speech translated into your native language.
This will be extremely useful for people on the go, talking with clients for project planning, etc.
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Source: Google Translate Blog