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Scanning thousands of native English clips with synchronized subtitles and exact timestamps.
Pronunciation Guide
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Listen to native speakers pronounce “polysilicon” in real conversational contexts with synchronized timestamps and subtitles.
And indeed, those costs are dropping.But polysilicon for instance, represents just a fifth of the cost of an installed solar system.The bulk of a solar system is low tech things like copper, glass, aluminum, framing, transportation, installation.