Road roller e óculos: o que têm em comum

1. Passo 1. Road roller — evoluiu de — Watt steam engine. The first rollers were steam-driven.
2. Passo 2. Watt steam engine — tem como parte — Volante de inércia. The flywheel evens out rotation.
3. Passo 3. Volante de inércia — inclui — Reaction wheel. A flywheel.
4. Passo 4. Reaction wheel — faz parte de — Space telescope. Pointing Hubble.
5. Passo 5. Space telescope — é um tipo de — Telescope. A space telescope is a telescope above the atmosphere, so air does not blur the view.
6. Passo 6. Telescope — evoluiu de — Óculos. The first telescopes were assembled by spectacle makers.

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