Scooter step-through body e watt steam engine: o que têm em comum

1. Passo 1. Scooter step-through body — faz parte de — Motor scooter. A leg shield and floor.
2. Passo 2. Motor scooter — tem como parte — Internal combustion engine. A two-stroke engine.
3. Passo 3. Internal combustion engine — evoluiu de — Watt steam engine. The combustion engine inherited the “cylinder — piston — crank” layout from the steam engine, moving combustion inside the cylinder.

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