Millstone e solar panel: o que têm em comum

1. Passo 1. Millstone — faz parte de — Windmill. A windmill turns the millstones.
2. Passo 2. Windmill — evoluiu para — Wind turbine. A windmill with a generator instead of millstones.
3. Passo 3. Wind turbine — tem como parte — Electric generator. A generator.
4. Passo 4. Electric generator — inclui — Solar panel. A solar panel also generates electricity — from light rather than rotation.

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