On clicking the Speaker icon in front of the translated text, the Hindi words are read out by a female voice. This feature relies on Flash. The translation is not perfect always.
As Google admits...
Clear and accurate speech technology is difficult to perfect, but we will continue to improve the performance and number of languages that are supported.
I hope more Indian languages get supported by Google Translate & it's text-to-speech functionality lets Indians appreciate languages they don't know.
Also see:
Google Script Converter transliterates between Indian languages
Read Telugu news sites in transliterated English
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